Anchor Alarm Pro
Anchor Alarm Pro
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.
No login, no subscription. Share a code to watch from any device.
Built with sailors, for real anchorages. The details that matter when the wind picks up at 3am.
A loud on-board siren plus push notifications the instant the boat leaves the safe zone, even with the app closed.
Leave one phone on the boat and keep an eye from a second phone or a laptop ashore. No shared account, just a code.
Phone GPS, a Bluetooth receiver, your chartplotter over NMEA, or Signal K. It picks the most accurate source automatically.
Free swing, mooring buoy, restricted room, bow and stern lines, or a Bahamian moor. Pick the type and set the zone.
A live swing view and a 24 hour track show holding from dragging at a glance, so a normal swing never fools you.
The full anchor watch with no account and no sign up. Open it, drop the hook, and you are watching in seconds.
Phone and tablet GPS, an external Bluetooth receiver, NMEA 0183 over the network from a Garmin, B and G or Raymarine plotter, or Signal K from a Victron Cerbo. Auto mode always uses the most accurate live source.
Drop the anchor at your position, set the swing radius from depth and rode, and arm the watch. The track records your swing so you can tell a wind shift from a dragging anchor at a glance.
What crews say after a season at anchor with Anchor Alarm Pro.
"Dropped the hook in a crowded bay and slept like a baby. The night we did move, the drag alarm had us up and sorted in seconds."
"I run it on an old phone at the helm and watch from my bunk on my own phone. The bow and stern corridor is perfect for our Med mooring."
"Connected my chartplotter GPS over the boat network and the accuracy is excellent. Best free anchor watch I have used, full stop."
Download for iPhone and iPad, or open the web app right now. Free to use, no account required.