Garmin GPS 18
From Wildsong
GPS 18 is a 12 parallel channel, WAAS-enabled sensor with a USB interface.
I got this one used on eBay when working with a client who was using IncidentView. I ended up not using it.
Garmin supported NMEA output by providing a program called Spanner but they stopped updating that in 2007. This device is unsupported. I should put it in the GPS museum in a locked glass display case.
Firmware
2016-Dec-11 Firmware updated to 3.30 (which came out in 2011) using WebUpdater on Plover.