Anchor! drag alarm 4+

simple drag alarm for sailors


    • $4.99


The simplest, most complete and most robust anchor drag alarm. Trusted since 2013 for daily anchor watch by hundreds of sailors sleeping aboard.

Be alerted if your anchor drags with a simple yet full of features app : Easy to use - Late set - Remote mode - Dark mode support - Arc or circle Perimeter - Watch app - Find my boat

Press the main button (anchor down) to set anchor position,
Touch the alarm circle on map to adjust alarm radius and you're ready.

Press the main button (anchor up) disables all alarms.

Main button to set anchor at your current position,
Choose a position on the map: relocate anchor with drag and drop.

Either set a value in settings,
Or adjust it directly by touching the alarm circle.

ALL INCLUSIVE: No add, no subscription, no in app purchase add on.


Attention catching visual alarm with a blinking black/white screen (foreground only),
Accoustic with ringtone choice (iPads needs to be unmuted in the Control Center),

REMOTE MODE: check your position and get alerted on a second device.
FIND YOUR BOAT: dinghy option in remote mode

FIND MY BOAT: Crowded anchorage? The remote features a dinghy mode that will shows directions to your boat.

WORKS OFFLINE! You still see your boat position relative to the anchor, the anchor position and the alarm circle. Once offline the map is replaced by a graphic.

WATCH COMPANION APP : anchor, snooze and stop alarms from watch.
Watch notifications are less intrusive and will silence the phone notifications. We thus recommend to opt-out watch notifications.

The boat track is recorded and a time-colored path is displayed on map. You can identify at first glance whether your anchor position is drifting or not.

Enable, disable and reset the track. Export it in CSV or GPX format.

Vertical map scale in feet or meters.

User interface compatible with dark mode for night use.

Compatible with flic and flic V2 buttons, no hub required. flic buttons are splash proof smart buttons and you may use them as a remote to set, snooze and stop alarms.

Strictly respects your privacy: we do not collect any of your personal information, ever.

Compatible with external GPS for best accuracy (required for iPad with no gps) : tested on gns2000 , Dual xgps, Bad Elf and Garlmin glo.

Compatible with Flic buttons.

legal notice:

When the alarm is on, this app will use GPS in the background to be able to alert you. Continued use of GPS in the background can dramatically decrease battery life: don't forget your charger on board.

The remote mode uses an external server that could be shut down without notice by its provider or run slow . The remote mode needs data connexion and 2 apple or android devices

Use of the remote mode comes is subject to the agreement to this supplementary copyright notice:
In addition to the applicable standard EULA, permission is not granted to use Anchor! to track someone without his dedicated and recent consent.

Provided maps are not nautical charts.

What’s New

Version 6.20

Critical alerts

Ratings and Reviews

4.4 out of 5
245 Ratings

245 Ratings

GordonC53 ,

Great Anchor Watch App

Just took a trip from Seattle to Glacier Bay AK and back using this app and it worked great. Just launch the app when you are ready to anchor and set the anchor location when you drop the hook. It will track the boat position from that point forward showing on the screen everywhere the boat has been since the set. It allows you to then set a radius alarm for any distance but since it will show the boat position when you back up to set the anchor you will see the radius at that time. Very reassuring to know how your boat is tracking and to do a quick check at night. It does consume a lot of battery so we run it with an iPad left charging. The app works in background as long as you don't close the app so you can use your device for other things and come back to the app and it will show the tracks made since you left it. Need to put your device in a location where it both gets GPS and someone can hear the alarm. Anywhere in the main cabin worked for us. It works with or without internet.

BobAthensGA ,

Excellent app---best one by far

My wife and I anchor out probably 60 nights per year. We needed an app that we could rely on as well as one that is easy to use. I have tried several other apps and none are close to as good as this one. When I sense a wind shift I love looking at the color coded lines that clearly show periods of time based on color. The new boat shift will be a new color and you can quickly tell if the boat is lying in the correct area. I also like the remote features so that when we go to shore we have a warning system. I have never written and app review but felt this app was superior and deserved a review.

Carsten999 ,

Outstanding stand-alone, remote monitoring is poor

This app is one of the best stand-alone anchor alarms that I’ve come across. It’s very easy to setup, and it worked as advertised throughout the night. The initial tutorial is helpful. I would give it 4-5 stars for the stand-alone features. One issue is that the alarm functions like any other sound. You can’t put DnD mode or set it to vibrate on your phone. This would be desirable, since I often get text messages at all hours and would like to set DnD but get audible anchor alarms. Most importantly, however, I paid for the app to use its remote monitoring feature. There is no tutorial for it, the FAQ/manual is sparse, and I couldn’t get it to work properly. I was hoping to find an anchor alarm that allows monitoring iOS device-to-device with alarm on the remote phone. I couldn’t get it to work, and I have programming background. At best it’s not user friendly, at worst the feature doesn’t work properly.

Developer Response ,

Dear carsten,
Please send an in app report for the monitoring feature, we’ll walk you through.

To get the alarm without other disturbances at night, you can use it in ‘plane’ mode. All internet notifications will be disabled without betwork yet anchor can wake you up.

To get the phone vibrate or flash up with the alarm, you can use the basic phone settings

App Privacy

The developer, Pomacanthus, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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