Note: Keep plugged in & screen unlocked.
Use Night Vision for a dark display.
How to use: Drop your anchor, let the boat settle in the wind and then press "Start Alarm" from your cockpit. The app monitors your boat's swinging pattern and sounds an alarm after two consecutive position fixes outside the chosen radius. Keep your device plugged in, leave the screen unlocked and use Night Vision to darken the display.
Disclaimer: Use at your own risk. This application is an electronic assistance tool and does not replace good seamanship, proper lookout, continuous anchor watches or mandatory navigation equipment. Liability for damages arising from injury to life, body or health and for intentional or grossly negligent breaches of duty remains unaffected. In all other cases, liability for slight negligence is excluded. No warranty is given for uninterrupted alerting or system availability.
Privacy: Data-minimal and anonymous. The onboard watch runs locally in your browser. When using remote shore monitoring, no GPS coordinates are sent to the server—only relative distance, bearing and status are temporarily transmitted under a 6-character session PIN and automatically deleted after watch termination or 48 hours of inactivity.
Progressive Web App (PWA): You can install this app directly on your home screen (e.g. via "Add to Home Screen" in Safari on iOS or Chrome on Android). Onboard watch runs offline via cached files and internal GPS. Please note that background execution and screen wake lock depend on your device settings and operating system battery management.
Imprint (§ 5 DDG): Made in Germany · Wellenweg GbR · Authorized Representative: Hauke Christoph · VAT-ID / USt-IdNr.: DE288696915 · Contact: info [at] schwojalarm.com · www.wellenweg.de