Ankr - Anchor Watch & Alarm

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.