A popular GPS communication protocol is the one specified by NMEA (see here). Communication is done in "sentences", which start with $-- where -- is the talker ID.

Page 18 of the linked specifications gives a list of possible talked IDs. I cannot seem to be able to find the talker ID of my GPS receiver (the datasheet is available here). I expect that it is one of CR, GN, GS or SN, but I don't know for sure.

What is the talker ID of my GPS receiver.

[Note: I am writing test software for a board for which the components only arrive in about 1 month.]

  • \$\begingroup\$ Have you asked the manufacturer? You could ask for a sample NMEA output log... Or just wait a month :) \$\endgroup\$
    – Justin
    Apr 27, 2012 at 14:34
  • \$\begingroup\$ DO note that many manufacturers may provide additional information using their own proprietary prefixes. It may not be a bad idea to actually hunt down the official list of sentences the module emits. \$\endgroup\$
    – AndrejaKo
    Apr 27, 2012 at 16:35

1 Answer 1


NMEA is used to connect several kinds of marine equipment with a PC, GPS is just one of these. GPS receivers should identify themselves as "GP". (GLONASS has "GL" as talker ID.)

Example GGA sentence:


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