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Hull Speed

Hull Speed

GPS speedometer, in knots

2 ratings
1 review
⚽ Sports
🗺️ Navigation
Free

Details

  • Released
  • Updated
  • June 30, 2026
  • July 16, 2026

Features

Developer

Peter Zink
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Hull Speed screenshot #1 for iPhone
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About

This app provides sailors with a clear and accurate GPS speedometer displaying speed in knots. It features a live trend graph to help optimize sail trim and can show your theoretical hull speed for easy comparison. It is designed for privacy with no ads or tracking.

✓Accurate GPS speed in knots
✓Live speed trend graph
✓Theoretical hull speed display
✓Apple Watch app with Keep Awake mode
✓Completely private, no tracking or ads
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What's New in Hull Speed

1.0.1

July 16, 2026

A new icon — a boat riding the wave that defines its hull speed.

User reviews

Most RecentHighest RatedLowest Rated

Trim Faster, Finish Higher

Hull Speed has completely changed how we trim sails during races. Real-time boat speed right in front of our trimmers means they get instant feedback on every adjustment, no more shouting back and forth to the helmsman and losing precious seconds (and focus) in the process.

The live speed readout plus the day’s speed graph make it easy to see what’s working and dial in trim on the fly. And a small but huge detail: the screen never dims or gets blocked by a screensaver mid-race, so the number you need is always right there at a glance.

Since adding it to our routine aboard More Equal, we’ve had more top-three finishes this season than ever before. Can’t recommend it enough for any racing crew looking to sharpen their trim game.
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FAQ

What is Hull Speed's main function?

Hull Speed is a GPS speedometer designed for sailors. It displays your speed over the water in knots with a live trend graph to help you optimize sail trim and see performance gains.

How accurate is Hull Speed?

It uses the same Doppler method as dedicated marine instruments for accurate GPS speed in knots, updated every second. This method does not require a paddlewheel to calibrate or that could foul.

Can Hull Speed show my boat's theoretical hull speed?

Yes, by entering your boat's waterline length, Hull Speed can draw your theoretical hull speed directly onto the graph. This allows you to easily see how close you are to reaching it.

Does Hull Speed have an Apple Watch app?

Yes, Hull Speed includes an Apple Watch app with a Keep Awake mode. This mode ensures the screen stays on while you are sailing, so you can easily check your speed.

Is my location data collected by Hull Speed?

No, Hull Speed is completely private. Your location is only used to compute speed on your device and is never stored, sent, or shared. There are no accounts, ads, or tracking involved.

Does Hull Speed have ads?

No, Hull Speed is ad-free. The app is designed to provide a clean and uninterrupted experience for sailors, with no advertisements present.

What devices does Hull Speed support?

Hull Speed is available for iPhone and Apple Watch. It is designed to be used on both devices for convenient access to your speed data while sailing.

How often is Hull Speed updated?

Hull Speed was last updated on June 30, 2026, with version 1.0. This indicates it is a new application, and future updates will likely be released to improve functionality and add features.