Well there's three parts to consider there:
the mobile GPS hardware
the display application
and the method of getting the GPS data from the vehicle to your application PC.
Commercial fleets often use something called AVL (automatic vehicle location) where they use a GPS receiver, an interface box and a two way radio to transmit the location back to a base radio receiver, and the transmitted data (possibly along with other vehicle specific data) is displayed typically on a custom written PC application. Taxis, ambulances etc are good examples of this.
Amateur 'ham' radio operators do this with a system called APRS. Just about any GPS that can output NMEA frames can be fed into a APRS TNC like a 'tinytrak' device - this then feeds data into a radio for transmitting. Any station on that frequency can then receive that information, and display it with freely available APRS software - and even overlay a map on the display.
A third option is replacing the radio to transmit the data with a mobile phone connection. Far more expensive due to call costs, but not dependant on radio range or special radio knowledge or licences.
As far as GPS units, pretty much any unit that spits out NMEA frames will do. As for interface boxes or 'tinytrak' devices - anywhere between $100 up to many thousands of dollars depending on level of customisation and logging required etc (tinytrak has no logging and minimal intelligence, other boxes will probably have more features and functions, possibly custom designed to the application).
Two way radio: if you're patient $200 should do for everything per radio. Licencing and other aspects of setting them up is a complete new kettle of fish. You'd have to research that seperately its a subject in its own right.
If you use mobile phones, the costs here should be well known. But consider that every speed change, every direction change will transmit a packet of data that the mobile phone will transmit back to you - and each will cost you something.
As for software: free to the sky-is-the-limit for custom designed
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