For boating · Knots
Boat Speedometer — Knots (Marine GPS)
This boat speedometer defaults to knots — tap Start on open water to see live speed in knots. Marine GPS usually gets a better lock than in cities.
Framed for boating. Unit switcher defaults to knots (1 m/s = 1.94384 knots). Note marine accuracy caveats: open water = usually better signal than dense urban areas (fewer reflections off buildings). Mention keep-screen-awake for long passages and that speed over ground is what GPS reports.
Tap Start to measure your speed. Your browser will ask for location permission — coordinates are processed locally and never sent anywhere.
--knots
--knots
--.--nmi
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Off by default. Only active while tracking — we never keep your screen on otherwise.
On a boat, keep the phone dry and with sky view. Knots is the marine standard — switch to km/h or mph if you prefer.
Coordinates never leave your device — Learn how GPS speed is measured →
Why knots?
Knots are nautical miles per hour — the marine standard. 1 knot = 1.852 km/h = 1.15078 mph. This page defaults the switcher to KNOTS so you see the right unit immediately.
GPS at sea
Open water has fewer multipath reflections than city streets, so accuracy is often good (≤15m). Near cliffs or in harbor with tall structures, check the badge.
Privacy-first — coordinates never leave your device
Processed locally in your browser, never stored on a server. Close the tab and it's gone. Learn how GPS speed is measured →
Frequently asked
Page-specific questions — same data drives the FAQ schema below.
Does GPS speed work well on open water?
Usually yes — open water has fewer buildings to block or reflect the signal, so accuracy is often better than in cities. Knots is the conventional unit because one knot equals one nautical mile per hour.
Why does this page default to knots?
Knots are the marine standard — one knot equals 1.852 km/h. This page starts in knots so you see the right unit immediately, but you can switch to km/h or mph.
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