This question is totally derived from @Katamarino's epic cross country yesterday....absolutely incredible!!! His flight was to simulate the big flight from Hawaii to California. That got me thinking. When he does that flight, can he bring with a gadget much like our Adsb in devices but instead see ships locations? Sure, not every drug runner and weirdo would be broadcasting their GPS location. But i could see big corporate shipping, Cruise Ships , and boats/yachts sending their info for better mariner rescue purposes. Does any maritime system like this exist? If so, is it open? Is it made by Garmin? Does it cost $17,995 and 2wks labor LOL You probably see where this is going: While way out over open water, if you could see several ships you could be continually considering those as ditching locations. Maybe even slightly altering course to minimize distance to them. And with a marine radio you could probably SOS them before feet get wet.