If I could chime in here about how we locate you in the Coast Guard. For the past few years I have been a pilot flying an HU-25 Falcon in the Gulf of Mexico doing search and rescue. I am currently in Spain transitioning over to our newest plane, the HC-144A Ocean Sentry (I will explain more later).
I always preach EPIRB's!!!! Behind lifejackets, flares and a good VHF (not cell phone) that is the best way we can find you. An EPIRB emits a signal to a satellite in the 406 MHZ range. Those satellites triangulate the position of the EPIRB which is when I get called (usually in the middle of the night when I am sleepy). We launch and head to the location of the signal. When it is not a GPS enabled EPIRB, it gets us in the general area (within a few miles) we then attempt to home in on the EPIRB listening to a beacon it gives out on an international distress frequency. This is the most difficult part. Even if it is the middle of the day, calm and I have a perfect position from a GPS enabled EPIRB, we can often fly right over you as small objects in the water can easily be missed. To illustrate this point, two years ago I flew over an overturned 70' shrimper that was giving off a perfect EPIRB and distress signal. It took me three passes to locate the boat with three people clinging to the hull because of the way the summer sun was reflecting off the deep blue water. It took us another 2 hours to locate the man who was .25 mile away floating in his lifejacket. This was in perfect conditions.
So the moral of the story is, make sure you can float (lifejacket), signal (flares), and call for help (good VHF and preferably an EPIRB). I can not recommend any particular product, but anything that can help us find you when we get in the area really helps!! So if your boat goes down and is still somewhat floating, stay with it!!!!! A boat is easier to find then a person in the water (PIW). To guard against being a lone piw difficult to find, it is good to have something on you that you can use to signal us with if you are floating alone (mirror, flares, dye or streamer). I personally carry a waterproof VHF and handheld GPS in my 2320's ditch kit.
The new aircraft we are bringing on line over here has a lot of new toys for us to help find you with!! They will be online in the Northern Gulf over the next few months, then down to S. Florida next. Hopefully I will never have to come looking for any of you, but if I do, please prepare yourself so it is a lot easier for us. I really like seeing these discussions here and from what I have seen on this board, most of the Parker owners are good mariners and prepare. If you have any questions about how we, the CG, really operate please ask, I have another month over here and a lot of time on my hands.