VIGIASleep. Vigia watches.
The anchor alarm that learns your swing circle and wakes you the instant the anchor drags — with the wind for the next 24 hours.
€0.99 — One-time purchase · no subscription · no ads
How it works
Three taps, then you can close your eyes.
Drop anchor
Position over the anchor and tap “Drop anchor”.
Vigia learns
The app watches the boat swing and draws your real circle.
Sleep easy
If the anchor drags, the alarm wakes you — even screen off.
Your swing circle, learned automatically
Instead of asking for your rode length, Vigia watches the boat turn with the wind and current, then computes the real pivot and radius. The guard circle fits your mooring.
What Vigia does
Mark your anchor: Vigia draws a guard circle and alerts you if the boat leaves it — even with the screen off and the silent switch on.
Learned swing circle
No rode length to enter — Vigia watches the boat swing and works out the real pivot and radius.
Reliable alarm
Selectable tones, audible over the silent switch. Guarded against a single bad GPS fix — no false alarms.
24-hour wind
Wind and gust forecast right at your mooring, with an adjustable alert threshold.
Background watch
Watches with the screen off, using adaptive GPS that eases off the battery once the circle is learned.
AirDrop hand-off
Pass the running watch to another iPhone to share the watch without re-entering anything.
Made for cruising
Recenter on the real pivot, pause when you go ashore, clean the track in one tap.
⚠️ Important — safety
Vigia is an aid, not a substitute for a proper watch. The app carries no nautical charts and cannot see hazards. The safety of the vessel and crew remains the sole responsibility of the skipper. Use at your own risk.
Frequently asked
Is there a subscription?
No. Vigia is a one-time €0.99 purchase, with no subscription and no ads.
Does the alarm sound on silent?
Yes, tones are audible over the silent switch. Keep the volume up and the battery charged.
Does it drain the battery?
GPS is adaptive: dense while learning, then easy on battery. Plug in for a full night.
Are there nautical charts?
No. Vigia is a watch aid; the safety of navigation remains the skipper's responsibility.
Requirements
iPhone and iPad on iOS 17 or later. “Always” location permission for the background watch. No account, no ads.