{"id":31,"date":"2026-09-07T08:02:19","date_gmt":"2026-09-07T08:02:19","guid":{"rendered":"http:\/\/localhost:8081\/boat-speedometer\/"},"modified":"2026-09-08T03:44:51","modified_gmt":"2026-09-08T03:44:51","slug":"boat-speedometer","status":"publish","type":"page","link":"https:\/\/speedometers.live\/fr\/boat-speedometer\/","title":{"rendered":"Boat Speedometer \u2014 Track Marine &amp; Sailing Speed with GPS"},"content":{"rendered":"<p>{&#8220;tagName&#8221;:&#8221;main&#8221;,&#8221;className&#8221;:&#8221;speedo-app&#8221;,&#8221;layout&#8221;:{&#8220;type&#8221;:&#8221;constrained&#8221;,&#8221;contentSize&#8221;:&#8221;860px&#8221;,&#8221;wideSize&#8221;:&#8221;1200px&#8221;}} &#8211;&gt;<\/p>\n<p><!-- ==========================================================================\n     HERO &amp; BOAT SPEEDOMETER TOOL CTA (Near top for instant mariner utility)\n     ========================================================================== --><br \/>\n\t<div class=\"speedo-hero skin-cyber mode-analog\" id=\"speedometerApp\" role=\"application\" aria-label=\"Speedom\u00e8tre en ligne\" data-skin=\"cyber\">\n\n\t\t<!-- Floating Exit Fullscreen Button (Visible in fullscreen mode) -->\n\t\t<button class=\"exit-fullscreen-btn\" id=\"btnExitFullscreen\" type=\"button\" aria-label=\"Quitter le mode plein \u00e9cran\" hidden>\n\t\t\t<span>\u2715<\/span> Quitter le plein \u00e9cran\n\t\t<\/button>\n\n\t\t<!-- Top App Header Bar: GPS Lock Status, Elapsed Time, HUD & Fullscreen Toggles -->\n\t\t<div class=\"speedo-top-bar\">\n\t\t\t<div class=\"top-bar-left\">\n\t\t\t\t<div class=\"gps-pill\" id=\"gpsBar\" role=\"status\" aria-live=\"polite\">\n\t\t\t\t\t<span class=\"gps-dot\" id=\"gpsIndicator\"><\/span>\n\t\t\t\t\t<span class=\"gps-status-text\" id=\"gpsText\">GPS: Acquiring\u2026<\/span>\n\t\t\t\t\t<span class=\"gps-acc-text\" id=\"gpsAccuracy\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"top-bar-center\">\n\t\t\t\t<div class=\"trip-clock\" id=\"tripClock\" title=\"Temps \u00e9coul\u00e9 du trajet\">\n\t\t\t\t\t<span class=\"clock-icon\">\u23f1\ufe0f<\/span>\n\t\t\t\t\t<span class=\"clock-val\" id=\"tripTimer\">00:00:00<\/span>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"top-bar-right\">\n\t\t\t\t<button class=\"top-icon-btn\" id=\"btnFullscreen\" type=\"button\" aria-label=\"Basculer le compteur de vitesse en plein \u00e9cran\" title=\"Mode tableau de bord plein \u00e9cran\">\n\t\t\t\t\t<span class=\"icon-fs\">\u26f6<\/span>\n\t\t\t\t<\/button>\n\t\t\t\t<button class=\"top-icon-btn\" id=\"btnQuickHud\" type=\"button\" aria-label=\"Basculer la r\u00e9flexion du pare-brise HUD\" title=\"R\u00e9troviseur pare-brise HUD\">\n\t\t\t\t\t<span class=\"icon-hud\">\ud83d\udee1\ufe0f<\/span>\n\t\t\t\t<\/button>\n\t\t\t\t<button class=\"top-icon-btn\" id=\"btnQuickMode\" type=\"button\" aria-label=\"Mode d&#039;affichage\" title=\"Mode d&#039;affichage\">\n\t\t\t\t\t<span class=\"icon-mode\">\u2699\ufe0f<\/span>\n\t\t\t\t<\/button>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- PWA Install Banner -->\n\t\t<div class=\"pwa-banner\" id=\"pwaBanner\" role=\"dialog\" aria-label=\"Installer l&#039;application Compteur de vitesse\" hidden>\n\t\t\t<div class=\"pwa-banner-inner\">\n\t\t\t\t<div class=\"pwa-banner-icon\">\u26a1<\/div>\n\t\t\t\t<div class=\"pwa-banner-info\">\n\t\t\t\t\t<strong>Installer le compteur de vitesse en ligne<\/strong>\n\t\t\t\t\t<span>Obtenir le mode plein \u00e9cran HUD et le suivi de vitesse GPS hors ligne<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"pwa-banner-actions\">\n\t\t\t\t\t<button class=\"pwa-btn-install\" id=\"pwaInstallBtn\" type=\"button\">\ud83d\udcf2 Installer l'application<\/button>\n\t\t\t\t\t<button class=\"pwa-btn-close\" id=\"pwaCloseBtn\" type=\"button\" aria-label=\"Ignorer\">\u2715<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- Skin Switcher Bar (Interactive Swipeable Designs) -->\n\t\t<div class=\"skin-bar\" id=\"skinBar\" role=\"region\" aria-label=\"Designs de compteur de vitesse\">\n\t\t\t<div class=\"skin-badge-wrap\">\n\t\t\t\t<span class=\"skin-badge\" id=\"skinBadge\">\u26a1 Cyber N\u00e9on<\/span>\n\t\t\t\t<span class=\"skin-swipe-hint\">\u25c4 Glissez \u00e0 gauche \/ droite pour changer le design du compteur \u25ba<\/span>\n\t\t\t<\/div>\n\t\t\t<div class=\"skin-dots\" id=\"skinDots\" role=\"tablist\" aria-label=\"S\u00e9lectionner l&#039;apparence du compteur\">\n\t\t\t\t<button class=\"skin-dot active\" data-skin=\"cyber\" role=\"tab\" aria-selected=\"true\" aria-label=\"Apparence Cyber N\u00e9on\" title=\"Cyber N\u00e9on\"><\/button>\n\t\t\t\t<button class=\"skin-dot\" data-skin=\"racing\" role=\"tab\" aria-selected=\"false\" aria-label=\"Skin Supercar Redline\" title=\"Supercar Redline\"><\/button>\n\t\t\t\t<button class=\"skin-dot\" data-skin=\"electric\" role=\"tab\" aria-selected=\"false\" aria-label=\"Skin Matrice de Luxe\" title=\"Matrice de Luxe\"><\/button>\n\t\t\t\t<button class=\"skin-dot\" data-skin=\"cockpit\" role=\"tab\" aria-selected=\"false\" aria-label=\"Skin Cockpit Tactique\" title=\"Cockpit Tactique\"><\/button>\n\t\t\t\t<button class=\"skin-dot\" data-skin=\"vintage\" role=\"tab\" aria-selected=\"false\" aria-label=\"Skin Chrono Classique\" title=\"Chrono Classique\"><\/button>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- Central Speedometer Gauge Display -->\n\t\t<div class=\"speedo-display\" id=\"speedoDisplay\" tabindex=\"0\" role=\"region\" aria-label=\"Compteur de vitesse interactif \u2014 Glissez vers la gauche ou la droite pour changer de design\">\n\n\t\t\t<!-- Left & Right Desktop Navigation Chevrons -->\n\t\t\t<button class=\"skin-nav-btn skin-nav-btn--prev\" id=\"skinPrevBtn\" type=\"button\" aria-label=\"Previous Gauge Design (Swipe Right)\" title=\"Design pr\u00e9c\u00e9dent\">\u2039<\/button>\n\t\t\t<button class=\"skin-nav-btn skin-nav-btn--next\" id=\"skinNextBtn\" type=\"button\" aria-label=\"Next Gauge Design (Swipe Left)\" title=\"Design suivant\">\u203a<\/button>\n\n\t\t\t<!-- Complete 270-degree Glowing Analog Gauge SVG with Physical Thorn Needle -->\n\t\t\t<div class=\"gauge-wrap\" id=\"gaugeWrap\" role=\"img\" aria-label=\"Compteur de vitesse analogique\">\n\t\t\t\t<svg class=\"gauge-svg\" id=\"gaugeSvg\" viewbox=\"0 0 340 340\" aria-hidden=\"true\">\n\t\t\t\t\t<defs>\n\t\t\t\t\t\t<!-- Needle 3D Drop Shadow -->\n\t\t\t\t\t\t<filter id=\"needleShadow\" x=\"-50%\" y=\"-50%\" width=\"200%\" height=\"200%\">\n\t\t\t\t\t\t\t<fedropshadow dx=\"2\" dy=\"5\" stddeviation=\"4\" flood-color=\"#000000\" flood-opacity=\"0.85\"\/>\n\t\t\t\t\t\t<\/filter>\n\n\t\t\t\t\t\t<!-- Needle Glow Filter -->\n\t\t\t\t\t\t<filter id=\"needleGlow\" x=\"-50%\" y=\"-50%\" width=\"200%\" height=\"200%\">\n\t\t\t\t\t\t\t<fegaussianblur in=\"SourceGraphic\" stddeviation=\"3.5\" result=\"glow\"\/>\n\t\t\t\t\t\t\t<femerge>\n\t\t\t\t\t\t\t\t<femergenode in=\"glow\"\/>\n\t\t\t\t\t\t\t\t<femergenode in=\"SourceGraphic\"\/>\n\t\t\t\t\t\t\t<\/femerge>\n\t\t\t\t\t\t<\/filter>\n\n\t\t\t\t\t\t<!-- Center Hub Bezel Gradient -->\n\t\t\t\t\t\t<radialgradient id=\"hubBezel\" cx=\"35%\" cy=\"35%\" r=\"65%\">\n\t\t\t\t\t\t\t<stop offset=\"0%\" stop-color=\"#64748b\"\/>\n\t\t\t\t\t\t\t<stop offset=\"60%\" stop-color=\"#334155\"\/>\n\t\t\t\t\t\t\t<stop offset=\"100%\" stop-color=\"#0f172a\"\/>\n\t\t\t\t\t\t<\/radialgradient>\n\n\t\t\t\t\t\t<!-- Center Hub Core Gradient -->\n\t\t\t\t\t\t<radialgradient id=\"hubCenter\" cx=\"40%\" cy=\"40%\" r=\"60%\">\n\t\t\t\t\t\t\t<stop offset=\"0%\" stop-color=\"#475569\"\/>\n\t\t\t\t\t\t\t<stop offset=\"75%\" stop-color=\"#1e293b\"\/>\n\t\t\t\t\t\t\t<stop offset=\"100%\" stop-color=\"#020617\"\/>\n\t\t\t\t\t\t<\/radialgradient>\n\t\t\t\t\t<\/defs>\n\n\t\t\t\t\t<!-- Outer Bezel Rings -->\n\t\t\t\t\t<circle class=\"gauge-bezel-outer\" cx=\"170\" cy=\"170\" r=\"166\"\/>\n\t\t\t\t\t<circle class=\"gauge-bezel-rim\" cx=\"170\" cy=\"170\" r=\"158\"\/>\n\t\t\t\t\t<circle class=\"gauge-dial-bg\" cx=\"170\" cy=\"170\" r=\"154\"\/>\n\n\t\t\t\t\t<!-- Decorative Inner Dial Accent Ring -->\n\t\t\t\t\t<circle class=\"gauge-dial-inner-ring\" cx=\"170\" cy=\"170\" r=\"114\"\/>\n\n\t\t\t\t\t<!-- Background Gauge Track (270 degrees, radius r=136) -->\n\t\t\t\t\t<circle class=\"gauge-track\" id=\"gaugeTrack\" cx=\"170\" cy=\"170\" r=\"136\" fill=\"none\"\n\t\t\t\t\t\tstroke-dasharray=\"640.9 213.6\" stroke-dashoffset=\"213.6\" transform=\"rotate(135 170 170)\"\/>\n\n\t\t\t\t\t<!-- Active Speed Fill Arc -->\n\t\t\t\t\t<circle class=\"gauge-value\" id=\"gaugeArc\" cx=\"170\" cy=\"170\" r=\"136\" fill=\"none\"\n\t\t\t\t\t\tstroke-dasharray=\"640.9 213.6\" stroke-dashoffset=\"640.9\" transform=\"rotate(135 170 170)\"\n\t\t\t\t\t\tstroke-linecap=\"round\"\/>\n\n\t\t\t\t\t<!-- Calibrated Ticks and Speed Numbers (0, 20, 40, 60... 200) -->\n\t\t\t\t\t<g class=\"gauge-ticks\" id=\"gaugeTicks\"><\/g>\n\n\t\t\t\t\t<!-- Center Digital Speed Readout Plate inside the Dial -->\n\t\t\t\t\t<g class=\"gauge-center-plate\">\n\t\t\t\t\t\t<rect class=\"digital-plate-bg\" x=\"110\" y=\"200\" width=\"120\" height=\"56\" rx=\"12\"\/>\n\t\t\t\t\t\t<text class=\"digital-plate-val\" id=\"speedValue\" x=\"170\" y=\"238\" text-anchor=\"middle\">0<\/text>\n\t\t\t\t\t\t<text class=\"digital-plate-unit\" id=\"speedUnit\" x=\"170\" y=\"252\" text-anchor=\"middle\">KM\/H<\/text>\n\t\t\t\t\t<\/g>\n\n\t\t\t\t\t<!-- THE SPEEDOMETER HAND \/ THORN NEEDLE (Anchored at 170, 170 spindle) -->\n\t\t\t\t\t<g class=\"gauge-needle-group\" id=\"gaugeNeedleGroup\" transform=\"translate(170, 170) rotate(-135)\" filter=\"url(#needleShadow)\">\n\t\t\t\t\t\t<!-- Needle Base Eyelet (Wraps center spindle) -->\n\t\t\t\t\t\t<circle class=\"needle-eyelet\" cx=\"0\" cy=\"0\" r=\"18\"\/>\n\t\t\t\t\t\t<!-- Needle Counterbalance Tail (Rear weighted fin) -->\n\t\t\t\t\t\t<path class=\"needle-tail\" id=\"needleTail\" d=\"M -6,14 L -5,38 L 0,46 L 5,38 L 6,14 Z\"\/>\n\t\t\t\t\t\t<!-- Aerodynamic Tapered Thorn Blade (Points towards circumference) -->\n\t\t\t\t\t\t<path class=\"needle-blade\" id=\"needleBlade\" d=\"M -7,0 L -5.5,-38 L -1.8,-138 L 0,-154 L 1.8,-138 L 5.5,-38 L 7,0 Z\"\/>\n\t\t\t\t\t\t<!-- Illuminated Needle Center Spine -->\n\t\t\t\t\t\t<line class=\"needle-spine\" id=\"needleSpine\" x1=\"0\" y1=\"-8\" x2=\"0\" y2=\"-146\" stroke-linecap=\"round\"\/>\n\t\t\t\t\t\t<!-- Needle Ultra-Sharp Thorn Tip Glow Point -->\n\t\t\t\t\t\t<polygon class=\"needle-thorn\" id=\"needleThorn\" points=\"-1.8,-138 1.8,-138 0,-156\"\/>\n\t\t\t\t\t<\/g>\n\n\t\t\t\t\t<!-- Center Spindle Crown Hub (Positioned right on top of needle pivot at 170, 170) -->\n\t\t\t\t\t<g class=\"gauge-center-hub\" id=\"gaugeCenterHub\" pointer-events=\"none\" transform=\"translate(170, 170)\">\n\t\t\t\t\t\t<circle class=\"hub-ring-outer\" cx=\"0\" cy=\"0\" r=\"20\" fill=\"url(#hubBezel)\" stroke=\"rgba(255,255,255,0.4)\" stroke-width=\"1.5\"\/>\n\t\t\t\t\t\t<circle class=\"hub-ring-mid\" cx=\"0\" cy=\"0\" r=\"13\" fill=\"url(#hubCenter)\" stroke=\"rgba(0,0,0,0.6)\" stroke-width=\"1\"\/>\n\t\t\t\t\t\t<circle class=\"hub-pin\" id=\"hubPin\" cx=\"0\" cy=\"0\" r=\"6.5\" stroke=\"rgba(255,255,255,0.6)\" stroke-width=\"0.8\"\/>\n\t\t\t\t\t\t<circle cx=\"0\" cy=\"0\" r=\"2.5\" fill=\"#ffffff\" opacity=\"0.9\"\/>\n\t\t\t\t\t<\/g>\n\t\t\t\t<\/svg>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- Primary Trip Telemetry Grid (3 Modular Cards) -->\n\t\t<div class=\"telemetry-grid telemetry-grid--primary\" role=\"group\" aria-label=\"T\u00e9l\u00e9m\u00e9trie du trajet principal\">\n\t\t\t<div class=\"telemetry-card\">\n\t\t\t\t<span class=\"telemetry-icon\">\u26a1<\/span>\n\t\t\t\t<span class=\"telemetry-label\">VITESSE MAX<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statMax\">0<\/span>\n\t\t\t\t<span class=\"telemetry-sub\" id=\"statMaxUnit\">km\/h<\/span>\n\t\t\t<\/div>\n\t\t\t<div class=\"telemetry-card telemetry-card--highlight\">\n\t\t\t\t<span class=\"telemetry-icon\">\ud83d\udcca<\/span>\n\t\t\t\t<span class=\"telemetry-label\">VITESSE MOYENNE<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statAvg\">0<\/span>\n\t\t\t\t<span class=\"telemetry-sub\" id=\"statAvgUnit\">km\/h<\/span>\n\t\t\t<\/div>\n\t\t\t<div class=\"telemetry-card\">\n\t\t\t\t<span class=\"telemetry-icon\">\ud83d\uddfa\ufe0f<\/span>\n\t\t\t\t<span class=\"telemetry-label\">DISTANCE<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statDist\">0<small> m<\/small><\/span>\n\t\t\t\t<span class=\"telemetry-sub\">odom\u00e8tre<\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- Secondary Environmental Telemetry Grid (3 Modular Cards) -->\n\t\t<div class=\"telemetry-grid telemetry-grid--secondary\" role=\"group\" aria-label=\"T\u00e9l\u00e9m\u00e9trie environnementale\">\n\t\t\t<div class=\"telemetry-card\">\n\t\t\t\t<span class=\"telemetry-icon\">\u26f0\ufe0f<\/span>\n\t\t\t\t<span class=\"telemetry-label\">ALTITUDE<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statAltitude\">--<\/span>\n\t\t\t\t<span class=\"telemetry-sub\" id=\"statAltUnit\">elevation<\/span>\n\t\t\t<\/div>\n\t\t\t<div class=\"telemetry-card\">\n\t\t\t\t<span class=\"telemetry-icon\">\ud83e\udded<\/span>\n\t\t\t\t<span class=\"telemetry-label\">CAP<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statHeading\">--<\/span>\n\t\t\t\t<span class=\"telemetry-sub\" id=\"statHeadingSub\">compass<\/span>\n\t\t\t<\/div>\n\t\t\t<div class=\"telemetry-card\">\n\t\t\t\t<span class=\"telemetry-icon\">\ud83d\udef0\ufe0f<\/span>\n\t\t\t\t<span class=\"telemetry-label\">ACCURACY<\/span>\n\t\t\t\t<span class=\"telemetry-value\" id=\"statAccuracy\">--<\/span>\n\t\t\t\t<span class=\"telemetry-sub\">GPS radius<\/span>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- Action Controls & Primary Start\/Pause -->\n\t\t<div class=\"control-bar-dashboard\" role=\"toolbar\" aria-label=\"Speedometer Controls\">\n\t\t\t<button class=\"dash-btn dash-btn--start\" id=\"btnStart\" type=\"button\" aria-label=\"Start Tracking\" hidden>\n\t\t\t\t<svg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"currentColor\"><polygon points=\"5 3 19 12 5 21 5 3\"\/><\/svg>\n\t\t\t\t<span>START TRIP<\/span>\n\t\t\t<\/button>\n\t\t\t<button class=\"dash-btn dash-btn--stop\" id=\"btnStop\" type=\"button\" aria-label=\"Pause Tracking\">\n\t\t\t\t<svg width=\"22\" height=\"22\" viewbox=\"0 0 24 24\" fill=\"currentColor\"><rect x=\"6\" y=\"4\" width=\"4\" height=\"16\"\/><rect x=\"14\" y=\"4\" width=\"4\" height=\"16\"\/><\/svg>\n\t\t\t\t<span>PAUSE TRIP<\/span>\n\t\t\t<\/button>\n\t\t\t<button class=\"dash-btn dash-btn--reset\" id=\"btnReset\" type=\"button\" aria-label=\"Reset Trip Data\">\n\t\t\t\t<svg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\"><polyline points=\"1 4 1 10 7 10\"\/><path d=\"M3.51 15a9 9 0 1 0 2.13-9.36L1 10\"\/><\/svg>\n\t\t\t\t<span>RESET<\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\n\t\t<!-- Segmented Unit Switcher -->\n\t\t<div class=\"unit-bar-dashboard\" role=\"radiogroup\" aria-label=\"Speed Unit\">\n\t\t\t<button class=\"unit-pill active\" data-unit=\"kmh\" type=\"button\" role=\"radio\" aria-checked=\"true\">KM\/H<\/button>\n\t\t\t<button class=\"unit-pill\" data-unit=\"mph\" type=\"button\" role=\"radio\" aria-checked=\"false\">MPH<\/button>\n\t\t\t<button class=\"unit-pill\" data-unit=\"ms\" type=\"button\" role=\"radio\" aria-checked=\"false\">M\/S<\/button>\n\t\t\t<button class=\"unit-pill\" data-unit=\"knots\" type=\"button\" role=\"radio\" aria-checked=\"false\">KNOTS<\/button>\n\t\t<\/div>\n\n\t\t<!-- Mode Selector Overlay -->\n\t\t<div class=\"mode-selector\" id=\"modeSelector\" hidden role=\"dialog\" aria-label=\"Display mode\">\n\t\t\t<button class=\"mode-opt active\" data-mode=\"analog\" type=\"button\">\n\t\t\t\t<span class=\"mode-opt-icon\">\ud83c\udfaf<\/span> Full Dashboard &amp; Needle\n\t\t\t<\/button>\n\t\t\t<button class=\"mode-opt\" data-mode=\"digital\" type=\"button\">\n\t\t\t\t<span class=\"mode-opt-icon\">\ud83d\udd22<\/span> Digital Numbers Only\n\t\t\t<\/button>\n\t\t\t<button class=\"mode-opt\" data-mode=\"hud\" type=\"button\">\n\t\t\t\t<span class=\"mode-opt-icon\">\ud83d\udee1\ufe0f<\/span> R\u00e9troviseur pare-brise HUD\n\t\t\t<\/button>\n\t\t\t<button class=\"mode-opt\" data-mode=\"fullscreen\" type=\"button\">\n\t\t\t\t<span class=\"mode-opt-icon\">\u26f6<\/span> Fullscreen Mode\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/div>\n\t<\/p>\n<p><!-- H1 &amp; Immediate Direct Answer Box (AEO Snippet Target) --><\/p>\n<div class=\"hero-desc\" style=\"margin-top: 1.5rem\">\n<h1 class=\"hero-title\">Boat Speedometer \u2014 Real-Time Marine GPS Speed Tracker &amp; SOG Tool<\/h1>\n<div class=\"direct-answer-box\" role=\"note\" aria-label=\"Direct Answer: Boat Speedometer\">\n\t\t<strong>Quick Answer:<\/strong> To check your <strong>boat speed online<\/strong>, secure your smartphone in a waterproof cockpit mount, tap <strong>Start Trip<\/strong> on the tool above, and allow location permissions. Your phone\u2019s GNSS satellite receiver calculates your true <strong>Speed Over Ground (SOG) in Knots, MPH, or KM\/H<\/strong> with typical open-water accuracy of \u00b10.1 m\/s (~0.19 knots). Unlike mechanical paddlewheel speedometers that get clogged by marine weeds, GPS measures true geographic velocity over the seabed regardless of tidal currents.\n\t<\/div>\n<p class=\"hero-subtitle\">Check true marine Speed Over Ground (SOG), calibrate mechanical transom paddlewheels, enforce harbor no-wake speed limits, and record maximum offshore velocity in knots, mph, or km\/h.<\/p>\n<\/div>\n<p><!-- ==========================================================================\n     SECTION 1: How to Check Boat Speed Online Using GPS\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"how-to-check-boat-speed\">\n<h2 class=\"section-heading\">How to Check Boat Speed Online in 3 Simple Steps<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\">\n\t\t<strong>Direct Answer:<\/strong> Boaters can check vessel speed online in three simple steps: <strong>1)<\/strong> Open this <a href=\"\/fr\/boat-speedometer\/\">Boat Speedometer<\/a> in your mobile browser; <strong>2)<\/strong> Tap <strong>Start Trip<\/strong> and choose <strong>&#8220;Allow&#8221;<\/strong> for location permissions; <strong>3)<\/strong> Secure your phone on the helm console under open sky to monitor live Speed Over Ground (SOG), peak velocity, and voyage distance.\n\t<\/div>\n<ol class=\"steps-list\">\n<li class=\"step-item\">\n<div class=\"step-title\">1. Open the Marine Speedometer Tool<\/div>\n<p>Launch this page on your phone or marine tablet via Safari, Chrome, Edge, or Firefox. You can also <a href=\"\/fr\/speedometer-app\/\">install this tool as a Progressive Web App (PWA)<\/a> for instant 1-tap full-screen access from your helm console with zero app store downloads.<\/p>\n<\/li>\n<li class=\"step-item\">\n<div class=\"step-title\">2. Enable High-Accuracy Geolocation<\/div>\n<p>Tap <strong>Start Trip<\/strong> and select <strong>&#8220;Allow While Using App&#8221;<\/strong>. Place your phone in a waterproof helm cradle or dashboard mount with an unobstructed view of the open marine sky.<\/p>\n<\/li>\n<li class=\"step-item\">\n<div class=\"step-title\">3. Monitor Live Marine SOG Telemetry<\/div>\n<p>As you advance the throttle or trim your sails, the digital dial displays your <strong>instantaneous Speed Over Ground (SOG)<\/strong>. Toggle between <strong>Knots (kn)<\/strong>, <strong>MPH<\/strong>, and <strong>KM\/H<\/strong>, or switch to dark HUD mode for night coastal passages.<\/p>\n<\/li>\n<\/ol>\n<div class=\"prose\">\n<p>Planning an extended coastal passage and want to track cumulative voyage mileage? Explore our <a href=\"\/fr\/speed-tracker\/\">Speed Tracker Telemetry Hub<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 2: How GPS Measures a Moving Boat's Speed (SOG)\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"how-gps-measures-boat-speed\">\n<h2 class=\"section-heading\">How GPS Measures a Moving Boat&#8217;s Speed Over Ground (SOG)<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\">\n\t\t<strong>Direct Answer:<\/strong> A marine GPS speedometer measures vessel speed using <strong>Doppler frequency shift<\/strong> and high-frequency multi-constellation satellite trilateration (GPS, Galileo, GLONASS, BeiDou). As the boat glides across water, incoming radio carrier frequencies shift in proportion to velocity, calculating true 3D horizontal displacement over the Earth&#8217;s seabed every second.\n\t<\/div>\n<div class=\"prose\">\n<p>Unlike mechanical boat speedometers mounted on the transom, an online <a href=\"\/fr\/gps-speedometer\/\">GPS Speedometer<\/a> calculates vessel velocity using fundamental satellite radio physics:<\/p>\n<ul>\n<li><strong>Doppler Velocity Calculation ($Delta f$):<\/strong> Satellites continuously broadcast precision atomic clock signals. By measuring the minute frequency compression of incoming radio carriers across multiple satellites simultaneously, your phone calculates exact velocity relative to Earth&#8217;s center.<\/li>\n<li><strong>Immunity to Water Drag &amp; Cavitation:<\/strong> Traditional transom sensors suffer from turbulence, boundary layer drag, and propeller aeration. GPS calculates speed purely from orbital triangulation, completely immune to hull hydrodynamics.<\/li>\n<li><strong>Geodesic Distance Delta ($Delta d \/ Delta t$):<\/strong> Second-by-second coordinate fixes calculate nautical voyage distance using the Great-Circle Haversine equation.<\/li>\n<\/ul>\n<p>Traveling by air or high-speed rail instead? Check out our <a href=\"\/fr\/flight-speed\/\">Flight Speed Tracker<\/a> and <a href=\"\/fr\/train-speed\/\">Train Speed Guide<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 3: GPS Speed (SOG) vs. Marine Speedometers (STW)\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"sog-vs-stw\">\n<h2 class=\"section-heading\">GPS Speed (SOG) vs. Marine Dashboard Speedometers (STW): Why Readings Differ<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\">\n\t\t<strong>Direct Answer:<\/strong> <strong>Speed Over Ground (SOG)<\/strong> is your true speed relative to the Earth&#8217;s seabed (measured by GPS). <strong>Speed Through Water (STW)<\/strong> is your speed relative to the surrounding water (measured by a transom paddlewheel or pitot tube). SOG and STW differ because ocean currents, river flows, and tidal streams push the boat ($ text{SOG} = text{STW} pm text{Current} $).\n\t<\/div>\n<div class=\"content-media-wrap\" style=\"margin: 1.5rem 0\">\n\t\t<img decoding=\"async\" src=\"\/wp-content\/themes\/speedometer-theme\/assets\/images\/gps-sog-vs-marine-speedometer-stw.webp\" alt=\"Comparison between GPS Speed Over Ground and marine paddlewheel Speed Through Water showing ocean current and tidal drift effects\" width=\"1200\" height=\"680\" loading=\"lazy\" style=\"width: 100%;height: auto;border-radius: 12px;border: 1px solid var(--border-color, #1e293b)\" \/>\n\t<\/div>\n<div class=\"prose\">\n<p>Here are the primary hydrodynamic and mechanical reasons why your boat&#8217;s dashboard gauge differs from GPS:<\/p>\n<ul>\n<li><strong>Tidal Currents &amp; River Flow:<\/strong> If your boat is cruising at $10text{ knots STW}$ downstream with a $3text{ knot}$ river current, your GPS SOG will read $13text{ knots}$. When motoring upstream against that same current, your GPS SOG drops to $7text{ knots}$, even though the dashboard gauge still reads $10text{ knots}$.<\/li>\n<li><strong>Paddlewheel Bio-Fouling:<\/strong> Transom paddlewheels are prone to becoming jammed or restricted by marine algae, seaweed, barnacles, and silt. A fouled paddlewheel under-reports speed or drops to zero entirely, while GPS remains 100% operational.<\/li>\n<li><strong>Pitot Tube Clogging:<\/strong> Water-pressure pitot tubes on outboard lower units frequently clog with lake mud, sand, or wood pulp, causing the needle to stick. GPS operates independently of water intake.<\/li>\n<\/ul>\n<p>Want to benchmark your vessel&#8217;s gauge calibration? Follow our step-by-step <a href=\"\/fr\/speedometer-test\/\">Speedometer Accuracy Test Protocol<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 4: Nautical Speed Units: Knots, MPH &amp; KM\/H\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"nautical-speed-units\">\n<h2 class=\"section-heading\">Marine Speed Measurement Units: Knots vs. MPH vs. KM\/H<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\">\n\t\t<strong>Direct Answer:<\/strong> Maritime navigation universally uses <strong>Nautical Knots (kn)<\/strong>. <strong>1 Knot = 1 Nautical Mile per Hour = 1.150779 mph = 1.852 km\/h<\/strong>. One nautical mile equals exactly one minute ($1&#8217;$) of latitude along Earth&#8217;s meridians.\n\t<\/div>\n<div class=\"content-media-wrap\" style=\"margin: 1.5rem 0\">\n\t\t<img decoding=\"async\" src=\"\/wp-content\/themes\/speedometer-theme\/assets\/images\/marine-boat-speed-categories-and-knots.webp\" alt=\"Marine vessel speed benchmarks and nautical units guide showing knots, mph, and km\/h across boat categories\" width=\"1200\" height=\"680\" loading=\"lazy\" style=\"width: 100%;height: auto;border-radius: 12px;border: 1px solid var(--border-color, #1e293b)\" \/>\n\t<\/div>\n<div class=\"prose\">\n<p>Here is a quick reference table showing standard maritime velocity benchmarks across vessel categories:<\/p>\n<div class=\"table-responsive\" style=\"margin: 1.5rem 0\">\n<table class=\"specs-table\" style=\"width: 100%;border-collapse: collapse;text-align: left\">\n<thead>\n<tr style=\"border-bottom: 2px solid var(--border-color, #334155)\">\n<th style=\"padding: 10px 14px\">Marine Navigation Zone \/ Vessel<\/th>\n<th style=\"padding: 10px 14px\">Knots (kn)<\/th>\n<th style=\"padding: 10px 14px\">Miles \/ Hour (mph)<\/th>\n<th style=\"padding: 10px 14px\">Kilometers \/ Hour (km\/h)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px 14px\"><strong>Harbor &#8220;No Wake&#8221; Speed Zone<\/strong><\/td>\n<td style=\"padding: 10px 14px\">4 \u2013 6 kn<\/td>\n<td style=\"padding: 10px 14px\">4.6 \u2013 6.9 mph<\/td>\n<td style=\"padding: 10px 14px\">7.4 \u2013 11.1 km\/h<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px\"><strong>Cruising Sailboat (Displacement Hull)<\/strong><\/td>\n<td style=\"padding: 10px 14px\">6 \u2013 9 kn<\/td>\n<td style=\"padding: 10px 14px\">6.9 \u2013 10.4 mph<\/td>\n<td style=\"padding: 10px 14px\">11.1 \u2013 16.7 km\/h<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px\"><strong>Pontoon &amp; Bowrider (Planing Hull Cruise)<\/strong><\/td>\n<td style=\"padding: 10px 14px\">18 \u2013 35 kn<\/td>\n<td style=\"padding: 10px 14px\">20.7 \u2013 40.3 mph<\/td>\n<td style=\"padding: 10px 14px\">33.3 \u2013 64.8 km\/h<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px\"><strong>Offshore Go-Fast Speedboat \/ Jet Ski<\/strong><\/td>\n<td style=\"padding: 10px 14px\">45 \u2013 70+ kn<\/td>\n<td style=\"padding: 10px 14px\">51.8 \u2013 80.5+ mph<\/td>\n<td style=\"padding: 10px 14px\">83.3 \u2013 129.6+ km\/h<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px 14px\"><strong>Commercial Container Ship \/ Ferry<\/strong><\/td>\n<td style=\"padding: 10px 14px\">18 \u2013 24 kn<\/td>\n<td style=\"padding: 10px 14px\">20.7 \u2013 27.6 mph<\/td>\n<td style=\"padding: 10px 14px\">33.3 \u2013 44.4 km\/h<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Need to convert custom nautical measurements? Use our interactive <a href=\"\/fr\/speed-converter\/\">Speed Converter Calculator<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 5: Factors Affecting Marine GPS Readings\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"marine-gps-factors\">\n<h2 class=\"section-heading\">Factors Affecting Boat GPS Accuracy on Open Water<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\">\n\t\t<strong>Direct Answer:<\/strong> Marine GPS accuracy is influenced by <strong>cockpit mounting position (open helm vs enclosed fiberglass cabin)<\/strong>, <strong>water chop and wave pitch\/roll<\/strong>, and <strong>coastal bluff multipath reflection<\/strong>. Mounting the device high on the helm console provides unobstructed 360\u00b0 satellite line-of-sight.\n\t<\/div>\n<div class=\"prose\">\n<p>Keep these marine environmental factors in mind when taking readings on the water:<\/p>\n<ul>\n<li><strong>Open Water Line of Sight:<\/strong> Lakes and oceans offer optimal GPS conditions with zero tall buildings. Mounting your phone on a waterproof helm bracket ensures a clear lock on 12+ navigation satellites.<\/li>\n<li><strong>Wave Chop &amp; Vertical Pitch:<\/strong> In rough seas, vertical pitching and heaving adds slight cyclic oscillation to the instantaneous 3D velocity vector. Our tool applies Kalman filtering to smooth out wave surges and deliver stable cruising readings.<\/li>\n<li><strong>Enclosed Cabin Shielding:<\/strong> Operating a phone deep inside a thick fiberglass or aluminum below-deck cabin attenuates satellite radio signals. Always position the device on the open bridge or near a deck window.<\/li>\n<\/ul>\n<p>Looking for road and motorcycle tools? See our <a href=\"\/fr\/car-speed-test\/\">Car Speed Test<\/a> and <a href=\"\/fr\/motorcycle-speedometer\/\">Motorcycle Speedometer Guide<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 6: Boating Safety &amp; Navigation Best Practices\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"boat-safety\">\n<h2 class=\"section-heading\">Crucial Boating Safety Guidelines: Helm Lookout First<\/h2>\n<div class=\"featured-snippet-target direct-answer-box\" style=\"border-left-color: #ef4444\">\n\t\t<strong>\u26a0\ufe0f Critical Marine Safety Warning:<\/strong> Maintaining an active 360-degree visual lookout is the skipper&#8217;s primary legal duty (COLREGs Rule 5). Never stare at or adjust a phone screen while navigating through busy channels, harbor entrances, or shallow shoals.\n\t<\/div>\n<div class=\"prose\">\n<p>Follow these essential maritime safety practices:<\/p>\n<ul>\n<li><strong>Pre-Departure Setup:<\/strong> Launch the website, tap <strong>Start Trip<\/strong>, select your unit (Knots, MPH, or KM\/H), and secure your phone in a waterproof marine cradle before casting off your mooring lines.<\/li>\n<li><strong>No-Wake Zone Compliance:<\/strong> Use the speedometer to verify that your SOG stays strictly within harbor no-wake speed limits (typically 4\u20136 knots) to prevent shoreline damage and protect moored vessels.<\/li>\n<li><strong>Primary Navigation Equipment:<\/strong> This online speedometer is an auxiliary telemetry tool. Always rely on certified marine chartplotters, paper nautical charts, depth sounders, and visual bearings for primary navigational safety.<\/li>\n<\/ul>\n<p>Want a quick conversational check of your speed right now? Try our live <a href=\"\/fr\/how-fast-am-i-going\/\">How Fast Am I Going Tool<\/a>.<\/p>\n<\/p><\/div>\n<\/section>\n<p><!-- ==========================================================================\n     SECTION 7: Frequently Asked Questions (AEO FAQs)\n     ========================================================================== --><\/p>\n<section class=\"content-section\" id=\"faq\">\n<h2 class=\"section-heading\">Frequently Asked Questions About Boat Speedometers<\/h2>\n<div class=\"faq-list\">\n<div class=\"faq-item\">\n<details open>\n<summary>\n<h3 class=\"faq-question\">How can I check my boat speed online with GPS?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>To check your boat speed online, open <a href=\"\/fr\/boat-speedometer\/\">Boat Speedometer<\/a> in your mobile browser, tap <strong>&#8220;Start Trip&#8221;<\/strong>, allow location permissions, place your phone on the helm console, and navigate. Your real Speed Over Ground (SOG) displays live in Knots, MPH, or KM\/H.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">What is the difference between SOG and STW on a boat?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p><strong>SOG (Speed Over Ground)<\/strong> is your boat&#8217;s true speed over the Earth&#8217;s seabed (calculated by GPS). <strong>STW (Speed Through Water)<\/strong> is your speed relative to the water flowing past your hull (calculated by a paddlewheel or pitot tube). Ocean currents and tides cause SOG and STW to differ.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">Why is boat speed measured in knots instead of mph?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>Knots are based on nautical miles (1 nautical mile = 1 minute of latitude). This allows mariners and navigators to plot distances and chart coordinates directly on nautical charts without complex conversions.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">How accurate is a phone GPS speedometer on a boat?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>On open water with an unobstructed view of the sky, a smartphone GPS speedometer is typically accurate to within <strong>\u00b10.1 m\/s (~0.19 knots or 0.22 mph)<\/strong> at steady cruising speeds.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">Why does my boat&#8217;s paddlewheel speedometer stop working?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>Transom paddlewheels frequently get clogged by marine weeds, algae, barnacles, or debris. Because GPS calculates velocity from orbiting satellites, it is completely immune to paddlewheel fouling.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">What is a typical &#8220;No Wake&#8221; speed limit in harbors?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>Most marina and harbor authorities enforce a &#8220;No Wake&#8221; or idle speed limit of <strong>4 to 6 knots (4.6 to 6.9 mph \/ 7.4 to 11.1 km\/h)<\/strong> to prevent wave damage to docked boats.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">Do I need to download an app to check my boat speed?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>No. This speedometer runs directly in your web browser. You can also save it as a <a href=\"\/fr\/speedometer-app\/\">Progressive Web App (PWA)<\/a> for fast 1-tap helm access with zero app store downloads.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">Does this tool work offshore out of cellular network range?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>Yes. If you load this page before leaving cell coverage (or install the offline PWA), your phone&#8217;s internal GNSS receiver continues receiving satellite radio signals offshore without active mobile internet.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">Does this website store or upload my boating routes?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p><strong>No.<\/strong> Your privacy is 100% protected. All velocity calculations, peak speeds, and voyage statistics are processed locally in your device&#8217;s browser memory. No location or trip data is ever uploaded to our servers.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<div class=\"faq-item\">\n<details>\n<summary>\n<h3 class=\"faq-question\">How do I convert knots to mph or km\/h?<\/h3>\n<\/summary>\n<div class=\"faq-content\">\n<p>Use our interactive <a href=\"\/fr\/speed-converter\/\">Speed Converter Calculator<\/a> to instantly convert between knots, mph, km\/h, and meters per second.<\/p>\n<\/p><\/div>\n<\/details><\/div>\n<\/p><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>{&#8220;tagName&#8221;:&#8221;main&#8221;,&#8221;className&#8221;:&#8221;speedo-app&#8221;,&#8221;layout&#8221;:{&#8220;type&#8221;:&#8221;constrained&#8221;,&#8221;contentSize&#8221;:&#8221;860px&#8221;,&#8221;wideSize&#8221;:&#8221;1200px&#8221;}} &#8211;&gt; Boat Speedometer \u2014 Real-Time Marine GPS Speed Tracker &amp; SOG Tool Quick Answer: To check your boat speed online, secure your smartphone in a waterproof cockpit mount, tap Start Trip on the tool above, and allow location permissions. Your phone\u2019s GNSS satellite receiver calculates your true Speed Over Ground (SOG) in Knots, MPH, [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-boat-speedometer","meta":{"footnotes":""},"class_list":["post-31","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Boat Speedometer \u2014 Track Marine GPS Speed in Knots | Speedometers.live<\/title>\n<meta name=\"description\" content=\"Free GPS marine speedometer. Track boat and sailing speed in knots, km\/h, and mph using your phone. 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