Thus the rate may drop to once every two seconds, or three, etc. In particular, if a route is currently enabled, several sentences dealing with the next waypoint will be included. Unless needed, routes and waypoints should be disabled. Exactly how this is done is specific to each GPS unit, and I suggest you refer to your receiver's manual. At roughly a megabyte of data per hour from a typical unit, a Palm Pilot IIIxe can acquire about 7 hours of uncompressed data, with modern laptops good to go for several months.
Coastal outlines improve visualization.
The physical connection between the GPS receiver and the laptop computer is made with a cable you either make yourself or pay a surprisingly high price for from the manufacturer. The cables are wired to be compatible with DB9 style serial ports of PCs. If you're building your own cables, you may decide to have two versions, one for use with the Palm's mobile cradle cable and another for use with laptops. A third common configuration is a permanently wired installation in a building, with a cable running to the GPS or only to the antenna on the roof. A few examples for immediate processing include PilotGPS , tzgps and NMEA Mon .