On the left a Polstar
gps mouse it measures 4cm x 4cm, it's weather proof and has a magnetic
base that keeps it on your car. It supports nmea0183 v2.2 and works on
all the APRS Kenwood models TM-D700. TM-D710, TH-D7 (apart from some
early D7's). It will work off a 5V supply (I used a 7805 regulator IC), and
it gives a serial output (RS232) easily feed into a kenwood.
On the right is a GlobalSat gps mouse.
Power requirements, pin configuration and what radios it will work on is the same as the Polstar, although I have come across variants with different plugs so please check before connecting.
Its also weather proof and has a magnetic base just like the Polstar.