Safety Anchor Alarm is a GPS anchor alarm app for iPhone and Apple Watch that watches your boat while you rest — with an instant anchor drag alert the moment you move, even a meter.
Features
Built by sailors, for sailors. Every feature designed around real-world anchoring needs.
Continuously tracks your boat's position relative to where you dropped anchor. Precision down to a few meters.
The moment your anchor moves beyond your safe radius, you get a loud alarm. No missed alerts — even when your screen is off.
Set your own safe zone from 10 to 200 meters. Adjust it based on conditions, water depth, and how much chain you've let out.
See your anchor position, current boat position, and safe radius all on a real-time map. Visual confirmation at a glance.
Save your favorite anchorages and revisit them with stored coordinates. Build your personal library of trusted spots.
Calculate the right chain length, anchor scope, and swinging room. Take the guesswork out of anchoring safely.
Check your safe radius and anchor status right from your wrist. Glance down and know you're safe — no need to reach for your phone.
The full app runs natively on iPad, just like on iPhone — a bigger chart to watch your anchor from the cockpit or nav station.
How It Works
No complicated setup, no hardware needed. Just your iPhone and our app.
Anchor as you normally would. Once settled, open the app and tap to set your anchor position.
Adjust the safe zone radius based on your chain scope, water depth, and surrounding conditions.
Turn on the alarm and go about your day — or night. The app monitors your position continuously in the background.
If your boat drifts outside the safe radius, a loud alarm sounds immediately. React before it's too late.
App Preview
Clean, intuitive interface designed for quick access — even in rough seas.
Home Dashboard
Set radius and drop anchor
Alarm Active
Real-time anchor monitoring
Satellite View
Aerial map with live tracking
Night Mode
Easy on the eyes after dark
Anchor History
Your saved anchorage library
Lock Screen Widget
Monitor without opening the app
Anchorage Guides
Verified GPS coordinates, depths, holding, and a recommended anchor alarm radius for hundreds of anchorages across the Mediterranean and beyond.
App Store Reviews
Semplice e sicuro
“A really reliable app. I use it on my boat and it lets me sleep peacefully at anchor. Simple to set up and the alarm works perfectly. Highly recommended!”
Original: “App davvero affidabile, la uso sulla mia barca e mi fa dormire tranquillo all’ancora. Semplice da impostare e l’allarme funziona alla perfezione, consigliatissima!”
Perlamora1
App Store Italy · May 2026
Çok başarılı
“The app runs all night without interruption or problems. Saving the anchor points is a nice bonus too.”
Original: “Uygulama kesintisiz ve sorunsuz tüm gece çalışıyor. Demir noktalarını kaydetmesi de ayrı güzel.”
Poseidon2828
App Store Türkiye · May 2026
Never Anchor without it !
“I have been using this app for a few weeks now and it is very useful to have a sound sleep at night. I don’t worry about if the sail is moving anymore, the app notifies me if the GPS has changed. Quite handy !”
Cap’n Sparrow
App Store United Kingdom · Mar 2026
Copied word for word from the App Store, with an English translation where the review is in another language. Reviewer names are their App Store usernames. Read every review in the App Store
Pricing
The alarm itself is free. Premium adds the tools around it, and you can cancel any time in your App Store settings.
$0
Download and anchor tonight
Monthly or yearly
Optional subscription, cancel any time
Apple sets the Premium price for each country, and the App Store shows yours before you subscribe. Comparing options? See how nine anchor alarm apps compare on price and features.
FAQ
Download Safety Anchor Alarm and never worry about anchor dragging again. Free to download with optional premium features.
Free to download. Premium features available via subscription.