It also pinpoints those locations on electronic charts and enhances the data with aerial photos of many locations. Called MarineTrack, it allows you to follow the boat's route on a user-friendly Web site. MarineTrack is a private system that combines an internal GPS and Inmarsat-D transceiver. This data transmission system can also monitor and report bilge water, engine speed and other data sensor installations. Offshore boaters can use MarineTrack to keep friends and family informed of their routes when cruising in the Bahamas, Mexico or the Caribbean.
Offshore fishermen can use it as a safety feature.
Yacht owners who hire captains to run or deliver their boats can keep track of their location. Deep Blue Garmin has made a name for itself in the fishfinder market. It started with a series of instruments suitable mostly for fresh water, though some of the models listed depth specs for those who wanted to use the gear in salt water. The Fishfinder 100 was one such model. It had a 150-watt output for depth penetration to 300 feet in fresh water and 200 feet in brine.