Free anchor alarm for iPhone and Apple Watch.
Set your anchor position, choose a swing radius, and get a loud alert if the boat drifts. No account, no analytics, no subscription.
Three steps to set the watch.
Set the anchor
Drop the anchor point from your current GPS position the moment the anchor is set. NGA locks it as the centre of your watch circle.
Set the radius
Choose a swing radius and arc that match the anchorage, rode length, tide, and room around you. The circle is your safe area.
Keep watch
NGA watches GPS in the background and sounds a loud alarm if the boat leaves the swing circle. Live Activity and Apple Watch keep the status visible.
Everything is free.
No subscription and no paid tier. Every feature below is in the free app.
iPhone anchor alarm
Background GPS watch with a loud alarm
Apple Watch support
Wrist glance at status and controls
Live Activity
Lock-screen watch status
Dynamic Island
Persistent watch indicator
Optional iCloud remote watch
Private CloudKit, off by default
No account, no analytics.
No account
No login, no email, no profile. Open the app and set the watch.
No analytics
No analytics SDK, no ads, no attribution, no third-party tracking code.
On-device by default
Location and anchor history stay on your iPhone unless you turn remote watch on.
Private iCloud when remote
Remote watch uses your private CloudKit database. Pelagic Labs cannot read it.
Works offline, all night.
NGA runs drift detection on the device, so the alarm still sounds with no signal.
Background GPS watch depends on location permission and device battery. Keep the phone charged and plugged in overnight for long watches.