Anchor Pro

This app will help you to know if you are slipping or not when you drop an anchor based on your phone’s gps.

Before I purchased the upgrade the GPS was updating constantly. After my subscription was processed the GPS now updates at random intervals. I did notice if I wiggle my device then the GPS will update constantly. I emailed support and never got a response. I’m canceling my subscription. What a joke!

I’ve been using this app for 3 seasons, coastal cruising on a 34’ sailboat. It works decently well. Last night I had my drag radius set for 225’ to give the anchor a little time to reset because I had plenty of space. Anchor alarm went off after a 180deg swing reversal but did not go off for over 700’ putting us almost on another boat. Maybe it was user error, but this incident made me question the app.

I bought this several weeks ago to offer an additional layer of support when at anchor. I have now on several occasions used this product and found it doesn’t work consistently, often freezing my position while I am clearly moving, send no alarm signal for either moving outside the set radius or a for a lost GPS. All this while follow the directions- -new iPhone 15 -location services on ‘’Always”’, -app was the only one running -Lock Screen - ‘Never’ -device plugged into charger (88% charge) It worked nicely for a couple hours but I began to notice the boat was swinging with a wind shift but the app showed no motion. I double checked with my main Raymarine plotter - and the track there clearly showed me swinging but Anchor Pro map view was stationary. I toggled to the main screen and it shows me 87.3 feet from my anchor (not moving) last gps - 0 seconds. I picked up the iPhone and walked 25 feet to the stern of the boat - still showing 87.3 feet. I manually brought up my iPhone Home Screen, selected the Anchor Pro App and when the map screen came up the location dot immediately moved 45 degrees clockwise and backwards towards the swing limit. The main screen registered me 110.1 feet. Through the course of that night and the next day I saw similar behavior a number of times. While the app showed no movement, my chartplotter and my own eyes told a different story. I’d bring up the Home Screen for a moment, bring up Anchor Pro and watch my location indicator jump wildly to a new location. The next morning, we hauled anchor and started on our way to the next location. As we slowly let the anchorage I watched as Anchor Pro’s little pulsing dot didn’t move at all. About a quarter mile away I flipped to my Home Screen, back to Anchor Pro and the dot rocketed to the east and the alarm went off. Too little too late. This app cannot be trusted.

This is the best anchor alarm I have used. Helps me sleep better and can run in the background with no issues.

Application minimaliste. Très peu de fonctionnalités même dans la version payante. Réglages position de l’ancre a la limite du ridicule

Well optimized and reliable. No negative surprises. Rating and download volumes appear to be well earned.

I really like this app and I purchased the full version. My only complaint is that the circular (or semi-circular) field you set around your anchor is inconsistent on the map view when you zoom in. Part of the border disappears and you cannot see (graphically) how close to your border you are. Seems like a bug in the zoom function.

Could not sail without this app. Will upgrade just as a thank you!

The anchor alarm routinely “drifts” and sets off the anchor alarm even though the boat is not dragging. After several instances where the alarm went off and we didn’t appear to move I started cross checking it against other anchor alarms. No boat movement on other alarms or instruments but this app showed us quickly drifting outside the allowable swing circle. The alarm went off and the boat had not moved. Save your money.