Ankr - Anchor Watch & Alarm

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About this app

Drop the hook with confidence. Ankr watches it for you.
Ankr is a GPS anchor alarm and drag watch built for sailors who actually sleep at anchor. Set your swing circle when you drop, and Ankr monitors your boat's position continuously — sounding the alarm the moment you drift outside your safe zone, even when your phone is locked or the app is in the background.
Built by an offshore sailor who got tired of getting up every hour to check the chartplotter.
WHAT MAKES ANKR DIFFERENT
Most anchor alarms run on one phone. Ankr runs on every phone aboard.
With Multi-Device Sync, one device acts as the primary anchor monitor and every other device in your crew sees the same swing circle, the same boat position, the same alarm — in real time. Ashore for dinner and the boat drags? Everyone with Ankr open gets the alert at the same moment. No more "is anyone watching the boat?"
CORE FEATURES
⚓ Drop & Set

Mark your anchor position on the chart the moment you drop
Automatic swing radius from depth and rode scope (3:1, 5:1, 7:1)
Manual radius override for tight anchorages
Auto buffer distance for safety margin

📍 GPS Monitoring

Continuous tracking, 1–60 second update frequency
Live boat marker showing position relative to your anchor
Distance-from-anchor indicator
GPS accuracy threshold (5–30m) to suppress false alarms from drift

📡 Drag Detection

Instant alarm when your boat leaves the swing circle
Customisable alarm sound, vibration, and push notifications
Runs in the background with phone locked
Stale GPS and signal-loss alerts so you never anchor blind

🗺️ Charts & Visualisation

Standard and satellite chart views
Anchor marker plus scope circles showing swing area
GPS accuracy heatmap
Anchor history for reviewing past sessions

🔔 Smart Alerts

Loud drag alarm with vibration
Low battery warnings before monitoring cuts out
GPS loss and stale-data alerts
Push notifications even when the app is backgrounded

📱 Multi-Device Sync (Premium)

Share the anchor watch across every device aboard
Primary device drives the monitor; secondaries see live status
Real-time sync of position, alarms, and swing radius
Alarms fire on every connected device

⚙️ Configurable

Metric or imperial units
GPS accuracy threshold and update frequency
Full alarm controls — drag, vibration, battery, GPS

🔗 Sharing (Premium)

Share your anchor position with crew, friends, or other boats
Send via SMS, WhatsApp, email, or public map link

WORKS OFFLINE
Core monitoring runs on your phone's GPS — no cell signal required. Anchor in a remote bay, lose 4G, the watch keeps watching.
WHO IT'S FOR

Coastal cruisers and weekend sailors
Liveaboards anchoring most nights
Bluewater cruisers on long passages
Charter skippers and delivery crews
Anyone who drops the hook and wants to sleep

PRICING
Free: Core anchor monitoring, drag detection, alarms, GPS tracking — single device.
Premium: Multi-device sync, anchor sharing, advanced customisation, and collaboration tools. Subscription via Google Play.
A note on seamanship: Ankr is a monitoring tool, not a substitute for proper anchoring technique. Always set with appropriate scope in suitable holding ground with adequate swing room. Use Ankr as your watch — never as your only watch.

What’s new

Ankr helps boaters monitor their anchor and alerts them if their boat starts to drag. Drop your anchor, and Ankr automatically calculates a safe radius based on your boat's movement. Get instant alerts on all your devices
if you drift too far, your battery runs low, or GPS signal is lost. View your position on an interactive map with visual scope indicators, choose your preferred alarm settings, and share your location with crew members
across multiple devices.