How To read Solmeta GMAX log files

I have has a Solmeta GMAX-EOS now for two years so have much experience of it. Read my review of the Solmeta GMAX-EOS

The Solmeta GMAX geotagger saves a daily log file in text format. This file is in NMEA (National Marine Electronics Association) format which is essentially text, csv (Comma Separated Values). At first sight this seems fairly impenetrable. This page describes how to read it - some of the entries are repeated, which simplifies things.

Each entry has four lines starting with $. When a photograph is taken an extra line is included which is simply "flash". the four lines start with $GPRMC, $PTNTHPR, $GPGGA and $GPGSA - these identify the type of data that the line contains. A typical entry is


Let us examine these four rows one at a time. Call them rows A, B, C and D. The cells are separated by a comma (,) except for the checksum which is preceded by an asterisk (*) and are identified by numbers in the tables below.


NMEA File Format conversion

There is a free gps data format converter called GPSBabel which will accept NMEA files and will convert them to and from many other formats other formats.

Example log file

You can download a Solmeta Log File of a walk in Dorset starting and ending in Seatown, by way of Doghouse Hill, Eyle Down, Symonddbury (where we stopped in The Ilchester Arms), Shute's Lane, Hell Lane and Chideock.

This page is not complete so if you can help fill in, correct or expand any of the details - especially those marked ?***? which require more explanation, please contact me (Contact button at top!).

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Information compiled from various sources including APRS where a lot more information is available.
Page first published: Wednesday the 11th of October, 2017
Last modified: Wed, 15 Jul 2020 21:22:24 BST
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