Knot/Knop Meter

KnotMeter turns your iPhone into a precise GPS speedometer for your boat, no extra hardware, no subscriptions. Open it, head out on the water, and see exactly how fast you're going in knots.
Whether you're chasing a personal best, comparing boats with friends, or just curious what your hull can really do, KnotMeter measures it and remembers it.
MEASURE YOUR SPEED
• Real-time speed in knots (SOG) straight from GPS
• Live session max and average speed
• Four speedometer styles: dial, fixed 0–100, digital and bar
• Color heats up from yellow to red the faster you go
• GPS quality indicator so you know the reading is solid
MORE THAN A SPEEDO
• G-force meter, like a sports car
• Live compass heading
• Wind speed, direction and gusts
• Every run auto-saves with location, heading, wind and peak G
GLOBAL LEADERBOARD
• See the fastest boats in the world and in your country
• Filter by country, boat size, fuel (petrol/diesel/electric) and year
• The all-time champion shines at the top
• Add your boat with a photo, brand, model and engine details
BUILT FOR THE WATER
• Keeps measuring with the screen off or the phone stowed
• Water-only, it won't count speed from a car or a plane
• iCloud sync: your boats and runs follow you to a new device
• Sign in with Apple
• Dark and light themes
• Free
Download KnotMeter, hit the throttle, and find out how fast you really are.