Can it show knots for boating?

No — units are mph and km/h only. If you think in knots, convert at 1 knot ≈ 1.15 mph ≈ 1.85 km/h.

mph, km/h, Decimals and the Compass

Q: How do I switch between mph and km/h?

Settings → Speed units: Auto follows your device locale (mph in the US, km/h most elsewhere), or force mph or km/h explicitly — handy when driving across a border where signs change but your locale doesn't.

Q: What does the decimal speed toggle do?

It adds tenths to the readout — 61.6 instead of 62. Useful for calibration comparisons and slow-speed activities where whole numbers are too coarse; leave it off for a calmer display while driving.

A gauge you have to mentally convert is a gauge you'll misread at exactly the wrong moment. Two minutes in settings makes every readout native to how you think — here's the full tour.

Speed units: Auto, mph, km/h

Auto reads your device locale — mph in the US and UK, km/h nearly everywhere else — and is the right default for staying home. Force a unit when life disagrees with your locale: a US phone driving through Canada wants km/h to match the signs; a European visiting the States wants mph. The unit label always rides under the readout, so a borrowed phone never gaslights you. (No knots, sailors — convert at 1 kt ≈ 1.15 mph.)

Elevation units: Auto, ft, m

The altitude card follows the same pattern — Auto by locale, or forced feet/meters. Hikers and pilots-at-heart who think in one unit regardless of country: set it once and forget it.

Decimal speed: precision on demand

Off, the display rounds to whole numbers — calm and glanceable at driving speeds, where tenths are noise. On, you get 61.6 instead of 62 — the right mode for calibration runs against your car's dial, slow-speed activities where a whole number is too coarse, and anyone who simply enjoys watching physics with one more significant digit.

Compass: heading when it matters

The toggle shows or hides the compass inset on the gauge; the map view adds numeric heading in degrees. On for boating, trail rides and orientation-dependent activities; off for a cleaner dial when all you care about is the number.

Recommended setups

Daily driving: Auto units, decimals off, compass off — the calmest possible glance.
Calibration day: your dial's unit forced, decimals ON — you're measuring, so measure.
Boating: forced unit of choice, decimals on, compass ON — heading is half the point on water.
Border crossing: force the destination's unit before you cross; signs beat locales.

The under-appreciated one: decimal mode quietly improves the max-speed card too — a session max of 77.4 vs 77 matters when you're chasing a personal best down a ski run. Precision is free; take it when the activity earns it.

Your units, your gauge

Auto by locale or your explicit pick. Free on iPhone.

Download on the App Store

FAQ

How do I switch between mph and km/h?

Settings → Speed units — Auto by locale, or force either.

What does the decimal speed toggle do?

Adds tenths to the readout — best for calibration and slow-speed precision.

Can it show knots?

No — mph and km/h only; 1 knot ≈ 1.15 mph.