Everything You Need
At Anchor
Built by sailors, for sailors. Safety Anchor Alarm packs powerful monitoring tools into a simple, intuitive interface you can trust with your boat's safety.
GPS Anchor Monitoring
Safety Anchor Alarm uses your iPhone's GPS to continuously track your boat's position relative to your anchor point. The moment you drop anchor and activate the alarm, the app starts monitoring in real-time — even when your screen is off or your phone is locked.
- Real-time position tracking with GPS
- Background monitoring — works while phone is locked
- Live distance display in meters from anchor point
- Coordinate display for precise positioning
Instant Drag Alerts
If your boat moves beyond your set safe radius, a loud alarm sounds immediately. The alarm works even when your phone is locked, ensuring you never miss a critical alert while sleeping or away from your device.
- Loud alarm that cuts through ambient noise
- Works with screen locked and app in background
- Continuous monitoring with configurable update intervals
- Clear visual and audio feedback
Adjustable Safe Radius
Set your own safe zone radius based on conditions. Whether you're in a tight anchorage needing a small radius or anchored in an open bay with plenty of room, you have full control over the alarm trigger distance.
- Adjustable from 10 to 200+ meters
- Easy +/- controls for quick adjustment
- Visual radius overlay on the map
- Adapt to chain scope, depth, and conditions
Night Mode
Switch to a dark interface that's easy on the eyes during nighttime anchor watches. The dark theme reduces screen glare while still providing all the information you need at a glance.
- Dark color scheme optimized for night vision
- All monitoring features fully functional
- Reduces eye strain during night watches
- Quick toggle in app settings
Anchor Points Library
Build your personal collection of favorite anchorages. Every time you anchor, the app saves the location with details like date, radius used, and duration. Return to proven spots with confidence.
- Automatic session logging with date and time
- Track radius used and anchoring duration
- Edit names for easy identification
- Quick return to last anchor position
Lock Screen Widget
Monitor your anchor status without even opening the app. The iOS lock screen widget shows your current distance from the anchor, safe radius, and safety status at a glance — perfect for quick checks during the night.
- Current distance from anchor point
- Safe radius indicator
- Green/red safety status
- Updates automatically in real-time
Apple Watch Monitoring
Keep an eye on your anchor without ever reaching for your phone. Safety Anchor Alarm on Apple Watch shows your safe radius and current distance from the anchor point right on your wrist — a quick glance during the night is all it takes to know you're safe.
- Safe radius and live distance shown on your wrist
- Instant glance during night watches — no phone needed
- Green/red safety status at a glance
- Stays in sync with the iPhone app
iPad Support
Safety Anchor Alarm runs natively on iPad with the same full experience as on iPhone. The larger screen makes it perfect as a dedicated anchor watch at the nav station or in the cockpit — a big, clear chart of your boat, anchor point, and safe radius.
- Full iPhone app experience, optimized for iPad
- Larger map for a clearer view of your swing circle
- Ideal as a dedicated anchor watch station
- All monitoring, alerts, and tools fully supported
Learn More About Safe Anchoring
Our blog covers everything from anchoring technique to overnight safety. Try our free calculator to get the right chain length.
Ready to Anchor with Confidence?
Download Safety Anchor Alarm and never worry about anchor dragging again. Free to download with optional premium features.
Download for iOS