I wonder the If I have SailSafe on my Samsung Android and Samsung Tablet, If I can leave the Tablet on Boat, both have a GPS the Tablet can send an Email, just not make a call....The SailSafe for Android app will do that, but you need two phones and cell connectivity. You start the application (after dropping anchor, of course) and set an anchor radius (and sector if you want). There is an option to call another phone for alarms, so carry the second phone to the beach and it will alert you. The caveat (other than chasing your drifiting boat with your dinghy), is you absolutely need cell service for both phones or no notice.
Obviously the IDEA is that even in good conditions, which can change, I would just like to know the boat is not dragging hook, wind could change direction or tide and anchor not reset...