Sea Velocity

Marine Speedometer by GPS

Only for iPhone

Free

iPhone

Measure speed, course, distance and trip time on the water. Customise the main screen and use Cockpit Mode, speed alerts, Live Activity and 60-minute history. SeaVelocity is a privacy-focused marine speedometer for iPhone that uses Core Location and GPS to measure speed and course over ground in real time. It is designed for motorboats, sailboats, kayaks and other activities on the water. SPEED AND GPS • Large, easy-to-read current speed display • Units: knots, km/h, m/s and mph • Maximum recorded speed • Time-weighted average speed • Course over ground in degrees and compass direction • GPS status for permission, Precise Location, measurement freshness and accuracy • GPS smoothing in Direct, Balanced and Stable modes TRIPS • Start and stop a trip • Recording, paused and stopped trip states • GPS-based distance • Active trip time • Distance in nautical miles, miles or kilometres according to the selected unit • A current and valid GPS measurement is required before a trip can start • Active trip state, distance and time are stored locally • An active trip can continue after reopening the app • Trips are measured in the foreground and continue in the background only while Live Activity is active HISTORY • Rolling speed graph for the latest 60 minutes • Reference line for the app’s calculated average speed • Dedicated historical graph page • Option to display the graph directly on the main screen • History is stored locally on the device CUSTOMISABLE MAIN SCREEN COCKPIT MODE Cockpit Mode provides a clear full-screen display for use on board. • Portrait and landscape layouts • Extra-large speed figures • Current course • GPS status • Trip distance and trip time • Start or stop a trip directly from Cockpit Mode • Day theme • Night theme • High Contrast theme • Keeps the display awake while Cockpit Mode is open SPEED ALERT • Optional speed alert • Adjustable threshold in the selected speed unit • Test button for sound and vibration • Sound and haptic feedback when speed crosses the threshold upwards • Hysteresis reduces repeated alerts when speed remains close to the threshold • Speed alerts operate while the app is open and active LIVE ACTIVITY Live Activity displays only: • Current speed • Selected speed unit Updates are performed locally without a server, push notifications or a network connection. Stale speed is replaced by a dash after approximately eight seconds without a new valid GPS measurement. While Live Activity is active, GPS may continue in the background to keep current speed updated. This may increase battery use. When Live Activity ends or is dismissed, the app returns to normal foreground measurement. GPS PERMISSION AND ACCURACY SeaVelocity displays clear status when: • Location Services are off • Location permission has not been granted • Location permission is denied or restricted • Precise Location is off • The app is waiting for a GPS measurement • GPS reception is weak • GPS is available • GPS is ready for accurate measurement The status indicator can open the appropriate action to grant permission, request full accuracy or open iOS Settings. iOS does not provide a public API for displaying the number of satellites in use. Status is therefore based on Core Location permission, accuracy and measurement freshness. ACCESSIBILITY AND LANGUAGES • Light and Dark system appearance • Dynamic Type • VoiceOver-optimised labels • Localised numbers and units PRIVACY SeaVelocity requires no account and includes: • No advertising • No purchases or subscriptions • No analytics • No tracking • No third-party SDKs • No transmission of location, speed, course or trip data The following may be stored locally in the app’s private storage: • Selected speed unit • Main-screen display preferences • GPS smoothing mode • Speed-alert status and threshold • Cockpit theme • Maximum speed • Average speed • 60-minute history • Active trip status, distance and time The app includes an on-device Privacy Policy and a shortcut to iOS location settings.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, Jonas Hedberg, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Jonas Hedberg
    Size
    • 5.2 MB
    Category
    • Navigation
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    Location
    • This app may use your location even when it isn’t open, which can decrease device battery life.
    Languages
    English and 11 more
    • English, Danish, Faeroese, Finnish, French, German, Icelandic, Italian, Norwegian Bokmål, Norwegian Nynorsk, Spanish, Swedish
    Age Rating
    4+
    Copyright
    • © 2026 Jonas Hedberg
  • Privacy Policy

    • More by Jonas Hedberg