A precise anchor watch that sounds the alarm the moment you start to drag — and lets a second phone or a laptop ashore watch the boat with you. Works with the GPS you already have.
Free to use. No login — just share a code.
Live anchor circle, drift distance & bearing, track history.
Most anchor apps make you create an account, and to watch from a second phone every device has to log into the same account. We threw all that out.
Open it and you're watching. No email, no password, no sign-up — and no personal data collected.
Forget juggling the same login across phones. Share a 6-character code and any device can join the same watch.
An iPhone on the boat, an Android or a laptop ashore — they all follow the same anchor watch, live.
Phone GPS, a Bluetooth receiver, or your chartplotter / NMEA / Signal K network. Use whatever you've got.
From the phone in your pocket to the chartplotter at the helm — Anchor Alarm Pro reads them all and automatically picks the most accurate fix it can see.
Built-in location on iPhone, iPad and Android. Nothing extra to buy.
Pair an external BLE receiver (e.g. Garmin GLO, Bad Elf) that streams NMEA — better accuracy below deck.
Read your boat's own GPS over the network — NMEA sentences via TCP or UDP from a multiplexer.
Garmin, B&G, Raymarine and other plotters that broadcast position on the boat's Wi-Fi network.
Connect to a Signal K server (e.g. Victron Cerbo GX) over WebSocket for a live position feed.
Leave it on Auto and it always uses the most accurate connected source — or pin one yourself.
Open it and go — no account to create and no personal data collected. Set an anchor watch in seconds.
Leave one device on the boat and monitor from a second phone or a computer ashore. Share a 6-character code — that's the whole setup. Add as many devices as you like.
Loud on-board alarm, plus push notifications to remote devices the instant the boat drags outside the safe zone.
See the boat's swing and track over the last 24 hours on the chart, so you can tell holding from dragging at a glance.
Position updates are throttled and history is capped to 24 hours, so it sips battery and data.
A full anchor watch runs right in your browser — no install needed, and fully compatible with the iOS app over the same secure database.