I looked around a little bit, but I could not find the manual for the binary protocol. There is supposed to be one called: "Binary Message Protocol User’s Guide" If you could get your hands on one, it would list the commands available to talk to the gps. Here is just the general datasheet, but you probably have that already:
http://www.promelec.ru/pdf/GT-310F%20datasheet.pdf It only lists the NMEA protocol for data coming out of the gps, not binary commands.
(note that the manufacturer spelled the name of their website wrong in their documentation). So the real link is: www.unitraq.com
But their website has a data sheet with even less information. You may be able to ask them for the Binary protocol.
http://www.scalerobotics.com
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