Any GPS that supports the NMEA standard data   format,  which is to say virtually every GPS on the   market*, should work.  GlassView supports connections   via Bluetooth (wireless), USB and serial (COM).     We offer the GlobalSAT GPS receiver for sale on our   hardware page but most similar GPS receivers should   work.  Unfortunately we do not have the ability to   test all brands and models.  * Units connected via a   USB cable may need an appropriate USB-Serial driver   available from most manufacturers.  Some new Garmin   units, such as the 396 and 496, may require a very   inexpensive software 'bridge'.  Contact   Sales for further questions.