About this app
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.
Latest release
What’s New
The map now keeps the boat centred, so it stays in view while dragging. A stern-to berth with lines ashore is drawn at the right zoom instead of a dot in the bay. The app runs on iOS 17 now, so older iPhones can keep watch too.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 19, 2026 · 8:39 AM Free
Screenshots
