Coming from someone who dives as well as sails, being stranded in the ocean is a definite concern, one of a diver’s worst fears. Just saw this the other day and thought it was a very neat device. A bit pricy, but it's very small, has built in strobes, GPS, DCS, VHF, waterproof on the surface, water proof shut to 425 feet, and can attach it to your PFD. Still new, so I don’t know anyone that has one, but I will be buying one before my next ocean dive.
http://www.alertdiver.com/nautilus_lifeline This looks lie a great device.
When I dive, especially in the ocean, the boat boat driver would just kinda follow our bubbles. Just kidding.
We always had the float with dive flag attached tethered to us, (quick release of course), and they followed that.
But this does look like an awesome device, for alot of sports.
