Anchor Watch

Yachting Magazine: "probably the best dollar you've ever spent"
For more than a decade Anchor Watch has set the standard when it comes to guarding your boat and with over 40,000 users you know your boat is in safe hands.
"Anchor Watch" uses the GPS on your smartphone to monitor your boat's position. If the boat moves outside its limits, the program will alert you immediately. Not only on your device but on any device using your iCloud id.
No more sleepless nights, worrying whether your boat is dragging or not. Sleep sound knowing that a quick glance will assure you that all is ok. When you are onshore for dinner or a drink, you will receive an alert the moment your boat leaves the designated area. You can even track it in real-time.
The third generation of Anchor Watch has been rebuild from the ground up to provide the best user experience. It features sea maps navigation and nautical maps. It conserves bandwidth and still uses sophisticated GPS filtering, which avoids false alerts. You can also run it twice as long on the same battery.
Anchor Watch is meant to keep your boat safe, download now.