Be alerted if your anchor drags with a simple yet full of features app :
- Easy to use: Click once to set anchor position, touch the alarm circle on map to adjust alarm radius and you're ready.
- Easy to set anchor position:
-> a button to set anchor at your current position
-> choose a position on the map: relocate anchor with drag and drop.
- Easy to use with standard map gestures (zoom, scroll ...)
- Remote mode : check your position and get alerted on a second device
- Enhanced track recording: 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.
- Track management: enable, disable and reset the track. Export it by email in CSV format or GPX format.
- Possibility to choose the ringTone
- 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.
- 3 alarms methods :
-> Attention catching visual alarm with a blinking black/white screen,
-> Accoustic alarm,
-> In background: accoustic alarm with a notification.
- Mail alert
/!\ On some iPad models, you'll find Mute in the Control Center. Swipe up from the bottom of the screen to open the Control Center then disable Mute.

- Easy to adjust alarm distance:
-> either set a value in settings
-> or adjust it directly by touching the alarm circle
- Vertical map scale in feet or meters as you prefer.
- User interface darkened to help preserve night vision.

- No add
- Strictly respects your privacy: we do not collect any of your personal information, ever.


A review by Paul Shard (famous for the award winning cruising documentary Distant Shores): Well I have finally found a solution that works GREAT in the form of an App for my phone! I have been testing it for some time, but they recently came up with an update and it is now really great!

check the full review here:
Compatible with external GPS : gns2000 , Dual xgps, Bad Elf and Garlmin glo. With an external GPS you can use Anchor! on a Wifi only iPad and get improved accuracy on other models.
Compatible with Flic buttons (Bluetooth low energy buttons, they are splashproof, work locally and no hub is required to work with anchor)
Your 5 star rating on the app store makes us work harder to provide updates, don't hesitate to rate Anchor!

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 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 5.08

Added compatibility to Flic buttons (Bluetooth low energy buttons, they are splashproof, work locally and no hub is required to work with anchor)

Ratings and Reviews

4.1 out of 5
126 Ratings

126 Ratings

Sailing windward ,

Anchor is a great app

I’ve used this app for a few years. Love it. Easier to use and more informative than the alarm options in my other B& G Nav systems.
It would be really useful to be able to pre download the satellite map or use the already downloaded and saved google map or Ovitalmap. I do like to be able to see the boat position relative to the land but can only download after setting anchor position. Often I anchor in a place with no cell reception so cannot get the satellite overlay.

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.

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


Marie Hullo
9.1 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French

Age Rating
This app may use your location even when it isn't open, which can decrease battery life.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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