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General suggestions or questions about the SparkFun Electronics website
By tedd
On this page ... okup-guide
or more exactly below this paragraph: ... e-firmware
under the text "The string can be modified by sending any of the following commands:"
there are 2 commands missing from the list of commands, which I assume to be very useful for newcomers, like me:

#define ENABLE_TIME 't' // Enable/disable time log (milliseconds)
#define ENABLE_HEADING 'h' // Enable/disable estimated heading logging