GPS speedometer · Apple Watch
How fast,right now.
One dial, read at a glance. On a bike, in a car, on a train, in the air - raise your wrist and the number is already there. No sign-in, no setup, nothing recorded.
Drag the rail Let it come to a stop and the dial parks itself
The dial, in parts
Six things, one screen.
Everything below is the app's own interface, running here on the page. Change a unit and the watch above changes with it.
Colour is speed
Every reading has a fixed colour from 0 to 350 km/h. Forty is the same blue on a bicycle as it is crawling in traffic, so after a week you read the dial without reading the number.
The dial zooms
The scale follows your recent peak, so walking pace fills as much of the arc as motorway speed does - then it shrinks back once you slow down.
Rolling averages
Five, ten and thirty second means sit under the dial, so a single wobbly satellite fix never reads as a sprint.
Signal, height, heading
Horizontal accuracy - tinted green through red as the fix degrades - with altitude and compass bearing from the same reading.
Four units
Kilometres per hour, metres per second, knots or miles per hour. Pick one and it stays picked - it is the only thing eSpeed remembers.
Max, and how to clear it
The session best stays on screen. Press and hold it - here too - to throw away a bad GPS spike and start again.
Before you rely on it
What it can't do.
It runs in the foreground
eSpeed deliberately doesn't start a workout session, so watchOS suspends it - and stops location - shortly after the screen sleeps or your wrist drops. For a continuous read, keep the display awake: always-on, or the watch mounted where you can see it.
GPS lags, and sometimes lies
The number is derived from satellite fixes, so it settles a second or two behind you and needs a clear view of the sky. Tunnels, tall buildings and aircraft cabins all degrade it. When the fix is poor the app says so rather than inventing a figure.
It isn't a certified instrument
Treat it as a read-out, not a measurement. It is not calibrated, not certified, and not suitable anywhere an accurate or legally recognised speed matters.
Privacy policy
Nothing is collected.
espeed.terminalvelocity.co.nz/#privacy
No data collected
eSpeed has no accounts, no sign-in, no analytics, no advertising, no third-party SDKs and no servers. No personal information, usage data, identifiers or diagnostics are collected, stored off your device or shared with anyone - including us. The app makes no network requests at all.
Location stays on your watch
With your permission, eSpeed reads your location from Apple's Core Location while the app is open, and uses it only to work out the speed, acceleration, altitude and heading shown on screen. Readings are held in memory for about half a minute so the rolling averages can be calculated, then discarded. Nothing is written to storage and nothing is transmitted.
The one thing saved
Your chosen unit - km/h, m/s, kn or mph - is stored on the watch so the app opens the way you left it. That's the whole of it.
You stay in control
Location access is requested as "while using the app" only. You can withdraw it at any time in Settings → Privacy & Security → Location Services → eSpeed, and the app simply stops showing a speed. Deleting the app removes the saved unit with it.
Your responsibility
eSpeed is an informational display. It is not a safety device, not a navigation aid and not a certified speedometer. GPS can be inaccurate, delayed or unavailable, and watchOS can suspend the app without warning, so the reading may be wrong, stale or missing at any moment.
You are responsible for your own safety and for obeying the speed limits and laws that apply to you. Do not depend on eSpeed for legal speed compliance, for navigation, or in any situation where an incorrect or missing reading could cause harm or loss. Keep your attention on the road, the water or the track rather than on your wrist, and never operate a vehicle while looking at your watch. eSpeed is provided as-is, without warranty of any kind.
Changes and contact
If this policy changes, the updated version will be published on this page. Questions about privacy or about the app are welcome - the contact link is at the foot of this page.
Last updated 9 August 2026 · Terminal Velocity, New Zealand