OSM Map On Garmin/Garmin Common Header

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A reverse-engineering of Garmin's Common Header

The structure of the common header is the same in all Garmin subfiles.

Byte Offset Length (bytes) Description
0x000 10 ID-String (depends on the type of the subfile in question, but always of the form "GARMIN XXX" where XXX is the file-extension of that subfile.
0x00A 1 typically 0x01 (major part of file's version number?)
0x00B 1 typically 0x00 (minor part of file's version number?)
0x00C 2 Creation year
0x00E 1 Creation month
0x00F 1 Creation day
0x010 1 Creation hour
0x011 1 Creation minute
0x012 1 Creation second