Anchor Alarm Pro
GPS drag watch for sailors
About
This app functions as a reliable anchor watch, alerting you with a loud alarm if your boat drifts outside a set safe radius. It offers flexible anchor zones and accurate positioning options, allowing you to monitor your vessel remotely.
What's New in Anchor Alarm Pro
1.11.0
September 29, 2026
Fixes false alarms. Switching GPS source, say from a network feed to the phone's own location, no longer moves the boat and sounds a drag alarm: the watch keeps the position it trusts, and warns you after two minutes if the GPS stops making sense. A phone watching from ashore no longer sounds a drag the boat never reported, Stop on it silences that drag only, and it tells you when it is the one offline. On smaller iPhones the map tool panels no longer slip under the tab bar.
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FAQ
What is Anchor Alarm Pro?
Anchor Alarm Pro is a free navigation app designed to function as a dependable anchor watch. It alerts you with a loud alarm if your boat drifts outside a designated safe radius, ensuring peace of mind while at anchor.
Does Anchor Alarm Pro have ads?
No, Anchor Alarm Pro is ad-free. Users can enjoy the full functionality of the anchor watch without any interruptions from advertisements.
What types of anchor zones does Anchor Alarm Pro support?
Anchor Alarm Pro supports flexible anchor zones, including simple circular safe zones, sector zones for tidal swing, and bow/stern corridors for Mediterranean or stern-to mooring.
How does Anchor Alarm Pro ensure accurate positioning?
The app utilizes the iPhone's built-in GPS, can connect to external Bluetooth GPS receivers, and supports NMEA 0183 or Signal K data from chartplotters or boat networks, auto-selecting the most accurate source.
Can I monitor my boat remotely with Anchor Alarm Pro?
Yes, you can share a short code to link a second device for remote monitoring without needing an account. The secondary device receives drag alarms via push notification, even when backgrounded.
Is Anchor Alarm Pro suitable for overnight anchoring?
Yes, Anchor Alarm Pro is built for real cruising and keeping you safe overnight. Its loud alarm overrides silent switches and rings even when the phone is asleep, with a soft pre-alert before the full alarm.
What devices is Anchor Alarm Pro compatible with?
Anchor Alarm Pro is available for iPhone and iPad devices. It is rated for ages 4 and up.
How often is Anchor Alarm Pro updated?
The app was last updated on July 6, 2026, with version 1.2. This indicates a recent update and ongoing development.
