Anchor Alarm Pro

Anchor Alarm Pro turns your iPhone into a dependable anchor watch. Drop your anchor, set a safe radius, and the app sounds a loud, escalating alarm the instant your boat drags outside the zone — so you can actually sleep at anchor.

KEEPS YOU SAFE OVERNIGHT • Loud alarm that overrides the silent switch and rings even when the phone is asleep • Soft pre-alert first, then a full alarm if you don't respond • Smart drag detection that ignores normal swinging and won't false-alarm when you motor up to retrieve the anchor

FLEXIBLE ANCHOR ZONES • Simple circular safe zone around the anchor • Sector zones for swing on a single tide line • Bow/stern corridor for Mediterranean and stern-to mooring — point your bow and set how far the boat may move

ACCURATE POSITION, YOUR WAY • Built-in iPhone GPS • External Bluetooth GPS receiver for better accuracy • NMEA 0183 over TCP/UDP from your chartplotter, or Signal K from your boat network • Auto-selects the most accurate connected source

WATCH FROM YOUR PHONE OR FROM SHORE • Share a short code to link a second device — no account, no login • One phone stays on the boat; another monitors remotely and gets the same drag alarm via push notification, even backgrounded • Live boat position, track history, and battery status of the boat's device

BUILT FOR REAL CRUISING • Live map with your track, swing circle, and OpenSeaMap-style detail • Battery-conscious: eases off GPS while holding, sharpens up near the edge or while dragging • Scrub back through your night's track to see exactly where you sat

Anchor Alarm Pro is made by sailors, for sailors. Set it once and trust it.