[mkgmap-dev] [PATCH v1] GMP file support for the Displayer

Sun Aug 29 14:04:46 BST 2010

The patch makes it possible to use all files within GMP subfiles. This 
is necessary to analyze Garmin NT maps.

Writing of GMP files is not yet supported. I have used the description 
on http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/GMP_Subfile_Format.

Some notes:
* I have changed the Displayer. It does no longer wait until the end to 
write out its information. This is necessary because some outputs are 
very large (some hundreds of megabytes).
* All analyzes can now be made directly from the .img files. The 
subfiles need not be extracted before starting with the different 
analyze programs (NodDisplay, TreDisplay etc.).
* Maybe some code is broken to analyze non NT maps. Please let me know.
* Added analyze output for MDR 32/33. The format seems to be well known 
but I find it useful to have the possibility to analyze all parts of the 
.img file.

I would be happy to get some feedback. Hopefully this will revitalize 
discussions to find out some unkown parts of the Garmin file format.

WanMil
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