While GPS works nearly everywhere, there's no simple affordable system to transmit your location. Oceans are huge, and even sattelite transmitters don't cover

While GPS works nearly everywhere, there's no simple affordable system to transmit your location. Oceans are huge, and even sattelite transmitters don't cover everything. Example: http://www.gpstrackersandmore.com/spot2-gps-tracker http://www.gpstrackersandmore.com/spot2-gps-tracker http://www.findmespot.eu/en/index.php?cid=102 http://www.findmespot.eu/en/index.php?cid=102 Even if something like that worked perfectly, oceans are extremely dangerous. A huge wave can destroy even a large sailboat in seconds.