Anchor Spot

⚓ ANCHOR SPOT — Your Anchor Drag Guardian
Anchor Spot monitors your vessel's position 24/7 and sounds an alarm the if your anchor starts to drag — even with your screen off.
Built by a full-time cruiser, for cruisers.
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🚨 ANCHOR DRAG ALARM
Set your anchor, define your safe radius, and Anchor Spot watches over you. If you drift beyond your zone, a loud siren, vibration, and push notification wake you up instantly .
• Drop anchor at your GPS position, from the map, or by range & bearing
• Adjustable safe radius in meters or feet — slider up to 150m, type for more
• Visual warning circle at 80% of radius — early heads-up before the alarm fires
• Sector Guard: asymmetric safe zone for tide swings and tight anchorages
• Med mooring mode: stern-line corridor alarm for Mediterranean anchoring
• Yellow track trail showing exactly where your boat moved during the night
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📡 ALWAYS-ON MONITORING
• Runs as a foreground service — keeps watching all night with screen off
• Survives screen-off, battery savers, and aggressive OEM memory managers
• GPS phantom filter: multi-stage algorithm rejects false fixes before any alarm decision
• 4-reading confirmation before alarming — no false alarms from GPS glitches
• Wake lock ensures the alarm fires even in deep sleep
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📡 MASTER / SLAVE MODE
Leave a tablet on board when you go ashore. Both devices watch the same anchor zone, both devices alarm independently. The crew member ashore gets the same siren as the one on board.
• Each device computes its own alarm — no single point of failure
• Auto SMS crew alert with your position if the drag alarm fires
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🚤 DINGHY MODE
Going ashore by dinghy? Activate dinghy mode before you leave. No false alarms while you're away, your anchor position and settings are preserved, and your phone vibrates the moment you return inside the radius.
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🌊 LIVE MARINE DATA
• Real-time tide height with low and high predictions
• Speed Over Ground (SOG) warning — alerts you before the drag alarm fires
• NMEA 0183 instrument integration over WiFi (TCP/UDP), Bluetooth, USB — plus full SignalK support. Connects to NMEA 2000 networks via a standard gateway (OpenPlotter, iKommunicate) for live wind, depth, SOG and COG straight to your logbook.
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📖 SHIP'S LOGBOOK
A professional ship's log that writes itself while you sail.
• Automatic entries: wind shifts, course changes, hourly snapshots
• Manual entries: crew watch, propulsion, sail config with reef state, sea state, weather, notes
• Passage tracking: distance in nautical miles, duration
• Group passages into voyages — you name it!
• Export to PDF or CSV — beautifully formatted, ready to file or share
• Cloud backup via anonymous recovery code — no account, no email, no data sold
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🔧 MAINTENANCE CLIPBOARD
Keep your boat's service history in one place. Engine, generator, compressor, watermaker — log every service, track intervals, and know what's due next. Exportable to PDF or spreadsheet.
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⚙️ CUSTOMISE EVERYTHING
• Volume control, vibrate toggle, custom ringtone
• Battery warning alarm — pre-set at 15%
• Night mode with dimmed UI and dark chart
• Metric or imperial units throughout
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🔒 PRIVACY FIRST
Your logbook is yours. No account required. No data sold. No advertising. Your position stays on your device. Optional cloud backup uses an anonymous code you choose — we never see your identity.
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⚠️ SAFETY DISCLAIMER
Anchor Spot is a supplementary navigation aid only. It does not replace proper seamanship, official navigation equipment, or a certified anchor watch. Always follow maritime regulations and maintain situational awareness on board.