The following text files contain information on the NMEA-0183 data interface used for marine instruments, GPS receivers, etc.
The NMEA FAQ (version 6.1, Sept. 15, 1997, 26984 bytes) discusses the National Marine Electronics Association's standards for data communication between marine instruments (as used between a GPS and Autopilot, for example)
garmin65.nmea (4295 bytes) is an annotated listing of NMEA sentences sent by a Garmin GPS-65. The GPS-75 should be identical, and other models, including the GPS-55AVD should be much the same (prepared by Peter Bennett.)
garmin12xl.nmea (Nov 11/98) lists sentences tranmitted by a Garmin 12XL, in both NMEA 1.5 and NMEA 2.0 modes.
nmeatype.txt (15401 bytes)is an extract of the NMEA-0183 standard listing the sentence types, and detailing the formats of a few sentences.
nmeaws.txt (25600 bytes) is a good discussion of NMEA-0183 interfacing problems (and successes), sentence formats, etc. BASIC programs to send and receive NMEA data are included. By Wayne Simpson, Technical Editor, International Catalina 27 Association (wms@spin.att.com)
nmea_interface.txt (5232 bytes) shows a circuit to interface a Garmin GPS50 to a PC or Mac serial port. It is probably not needed with most PCs, but may provide a more "correct" interface. It should work with most GPS recievers having NMEA inputs and outputs. Posted to sci.geo.satellite-nav by Lorne Dudley (dudley2@qucdn.QueensU.CA)