Anchor Alarm Pro

Anchor Alarm Pro is a precise anchor watch for sailors and boaters. Drop your anchor, set how far the boat may swing, and relax. If you start to drag, a loud alarm wakes you, even overnight with the screen off and the app in the background.

Built by sailors, it does one job extremely well: tell you the moment your boat is no longer where it should be.

WAKES YOU WHEN IT MATTERS
• Loud, distinctive alarm that rings on the alarm channel, even while your phone is asleep
• Soft warning first, then escalates to the full alarm so you have a chance to react
• Smart filtering ignores single bad GPS fixes, so you get fewer false alarms

WATCH FROM A SECOND DEVICE
• Share a simple code and let another phone, or any web browser, follow the same boat
• A device ashore gets a push notification if the boat drags, even with its app closed
• One phone stays aboard as the boat; others watch remotely

EVERY KIND OF MOORING
• Anchored: a circular swing zone around your anchor
• Mooring buoy: a tight watch for a fixed mooring
• Sector zone: allow swing only across open water and alarm if you near the shore
• Bow and stern corridor: a snug box for stern-to berths and lines ashore

PRECISE BY DESIGN
• Use your phone's GPS, or connect a Bluetooth GPS receiver (e.g. Garmin GLO) for better accuracy
• Read position over Wi-Fi from a chartplotter, NMEA bridge, or Signal K server (e.g. Victron Cerbo)
• Set the anchor exactly: drop it where you are, point your phone toward it, or place it by bearing and distance
• Scope calculator sets the swing radius from your depth and rode

ON THE CHART
• Live map with your boat, anchor, swing circle, and track history
• Sea-chart styling with marine seamarks
• Scrub back through the night to see exactly where the boat has sat

EASY ON THE BATTERY
• Low-power mode uses coarser GPS and publishes less often while you are holding, then switches back to full precision near the edge of the zone or while dragging. Built for overnight watches.

HOW IT WORKS
1. Choose how you are secured and mark your anchor
2. Set the allowed distance
3. Anchor Alarm Pro watches while you sleep, and alarms if you drag

Anchor Alarm Pro is a safety aid, not a substitute for proper anchoring, a good watch, and seamanship. Always keep a lookout in changing conditions.