Here's one: http://www.royaltek.com/index.php/rgm-3600 http://www.royaltek.com/index.php/rgm-3600 There are dozens of variants, some with USB, some with RS232

Here's one: http://www.royaltek.com/index.php/rgm-3600 http://www.royaltek.com/index.php/rgm-3600 There are dozens of variants, some with USB, some with RS232, some with bluetooth. "Mouse" is common nomenclature for this kind of device, I don't know why. Basically, they all deliver continuous NMEA data over a serial line.