[mkgmap-dev] Selectable maps on gps

Wed Aug 26 09:58:52 BST 2009

MarkS wrote:
> My approach is:
> - Run splitter on a UK extract
> - Run mkgmap with the GMAPSUPP option turned on to create a single UK 
> file with (in my case) 11 sub-maps (one for each area). Make sure family 
> name is defined in the options.
> - Run mkgmap again using a different style (in this case a style file 
> showing speed limits and nothing else) again with the GMAPSUPP option 
> turned on so I get GMAPSUPP.IMG as an output. Make sure family name is 
> defined.
> - Run wgmaptool to combine these two GMAPSUPP.IMG files together. At the 
> same time I also add in typ files and a couple of other GMAPSUPP.IMG 
> files (one has contours and one is from OpenMTB). This creates a new 
> GMAPSUPP.IMG file with all the individual files combined.
> - Copy to an SD card and put it in the garmin
> - In the garmin go to the list of the maps (which is very long in my 
> case), press the menu button and it then lets you show/hide all the maps 
>   with the same family name in one go (so for example I can turn OpenMTD 
> on/off in one go).
> 
Very informative, thanks :-)