Have a look at
or
https://www.pinns.co.uk/osm/theme_editor.html
Although themes are text files, Garmin is particularly fussy about certain text characters and a surplus of spaces. When you modify them manually
you may find the theme is not recognized.
To a certain extent it is a matter of trial and error when converting a typ file to a theme, ie the theme only recognizes a limited number of types.
Typwiz6 can convert TYP files to themes - there may be others
Themes are saved in Garmin/themes folder
Good Luck
Nick
I was successfully building maps for a Montana with my own style. Since the Montana died, I replaced it with a Zumo XT. It isn't working so well now. I can use my map on qmapshack and it looks as expected, but on the Zumo it appears that Garmin does not recognize some (or all) my custom type codes. Any ideas what the limitations are, or how to work with this? They've added something called 'Map Theme', which is a small xml file. I don't see a way to load my typ file, but I didn't need to do that before since I included that with the mkgmap build.
Brad
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