Steve,
following link regarding Header Information in gmapsupp.img seems to be still valid:
https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/IMG_File_Format

At least using a hex editor to change Map's major version (Byte 0x08) and minor version (Byte 0x09) did show me the expected result afterwards.

But it tells me also that setting product-version to 1612 will not work at all.... I would have to set it to 16.12 with handling of that decimal in the background (splitting it up into major and minor) as a prerequisite.
No idea what would be best to handle it, but it's probably worth a try ?

Cheers
Patrik

On 18.12.2016 18:39, Steve Ratcliffe wrote:
Hi Patrik

# my mkgmap call for gmapsupp creation contains the option
'--product-version="1612"'
# when checking the created gmapsupp.img with GMapTool, the heades does
contain only 'v 0.00'

I am afraid I don't know where a product version is stored in the
gmapsupp.

If anyone knows I will add it..

..Steve
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