Boat Knot Meter: Anchor Watch for iPhone
Boat Knot Meter: Anchor Watch reads GPS speed over ground in knots, km/h, mph or m/s and keeps the essential numbers visible from the helm. After GPS lock, it reports course, accuracy status and 0.1-knot speed; a glitch guard suppresses obvious spikes near cliffs, bridges and marinas. Set an anchor radius of 10, 25, 50 or 100 metres for an audio and vibration drift alarm, or edit a local no-wake threshold. Trip logs include distance, max and average speed and export as GPX 1.1 or CSV. It is deliberately not a chartplotter, AIS, autopilot or certified navigation instrument, so it must sit alongside proper charts and safety equipment.
At a glance
- Platforms
- iPhone
- Price
- Free
- Category
- Navigation
- No ads
- ✓
- No tracking
- ✓
- Works offline
- ✓
- Last verified
- 2026-07-29
- Minimum OS
- 13.0
- Version
- 1.0
- Released
- 2026-04-29
What is it?
Boat Knot Meter: Anchor Watch is an app for GPS speed over ground, anchor-watch alarms, no-wake alerts, and GPX or CSV trip logs.
What problem does it solve?
A boat crew needs to see trustworthy speed and notice drift without guessing at a weak GPS fix. TrueFix exposes fix quality, rejects spikes, and alarms when an anchor radius or speed limit is crossed.
What it can do
- Speed Over Ground (SOG) in knots, km/h, mph or m/s
- Course Over Ground (COG) — compass + degrees
- Captain Mode — giant digits readable from the helm 2 m away
- Marine theme — high-contrast deep navy, full-sun friendly
- The boat knot meter app that doesn't lie.
- Real GPS speed in knots, with anchor watch and no-wake alarm built in.
- Works offline once you have GPS lock — no cell signal needed in open water.
- Boat speedometer for sailors, fishers and small-craft owners.
Screenshots
How to use it
Wait for a GPS lock, choose the speed unit, and read SOG and course. At anchor set a safety radius; for a harbour choose or edit the no-wake limit, then export the trip log when finished.
Who it is for
Sailors, fishers, paddlers, and small-craft owners who want speed and anchor monitoring.
Privacy and permissions
You can find the permissions an app may request in its store listing and on its support page. The linked legal pages explain how the app handles data and the privacy choices it provides.
Support is available through the app store.
FAQ
Does Boat Knot Meter: Anchor Watch include Speed Over Ground (SOG) in knots, km/h, mph or m/s?
Boat Knot Meter: Anchor Watch lists this feature in its store description: Speed Over Ground (SOG) in knots, km/h, mph or m/s
How does Boat Knot Meter: Anchor Watch handle Course Over Ground (COG) — compass + degrees?
Boat Knot Meter: Anchor Watch lists this feature in its store description: Course Over Ground (COG) — compass + degrees
What can Boat Knot Meter: Anchor Watch do with Captain Mode — giant digits readable from the helm 2 m away?
Boat Knot Meter: Anchor Watch lists this feature in its store description: Captain Mode — giant digits readable from the helm 2 m away
When is Marine theme — high-contrast deep navy, full-sun friendly useful in Boat Knot Meter: Anchor Watch?
Boat Knot Meter: Anchor Watch lists this feature in its store description: Marine theme — high-contrast deep navy, full-sun friendly
Can I use Boat Knot Meter: Anchor Watch for The boat knot meter app that doesn't lie?
Boat Knot Meter: Anchor Watch lists this feature in its store description: The boat knot meter app that doesn't lie.
Why would I use Real GPS speed in knots, with anchor watch and no-wake alarm built in in Boat Knot Meter: Anchor Watch?
Boat Knot Meter: Anchor Watch lists this feature in its store description: Real GPS speed in knots, with anchor watch and no-wake alarm built in.