Connect a GPS to one computer and then set up a wireless network. Clients in other vehicles can connect to the GPS on the host machine. Normally, only one program at a time can access a serial port - connected GPS. This can quickly become a problem. One probably want to run gpsmap to get maps, and then a program to log the position, and perhaps another program to let one create spatial annotations of the travels. That is way too many connections for a single-user serial port! Fortunately, GPSd is available as a daemon that connects directly to the GPS and then acts as a server for position information. Once one has GPSd installed, all of the GPS aware applications can share a single GPS.
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