[Quirine Schuyff]

The one I have, Standard Horizon HX870, had really good reviews and I have heard from others that it is one of the better choices. It has the one button emergency call and Digital Select Calling plus features like way points and coordinates you can input. Mine is waterproof, floats and has a flashing beacon to find it in the dark if dropped in the water. (Beacon automatically engages when submerged.)