[mkgmap-dev] OSM maps on the new eTrex 30

Sun Oct 2 20:14:35 BST 2011

On 10/02/2011 08:16 PM, Frank Fesevur wrote:

> At this moment, there are three gmap*.img files on my device. Two that
> came with the device and that one osm based (most recent
> openfietsmap.nl full version) that I used all day today. You can
> switch on and off maps as you like, so I guess (have to try this out)
> that mulitple osm based maps should not be a problem as long as the
> Family-IDs and the filenames are different. If you want to, I can try
> this tomorrow and let you know. Anything special you want me to try?

You can have more than one Family-ID in one gmapsupp.img. I use this
feature for contour line layers in my topo map:
http://www.kleineisel.de/blogs/index.php/osmmap/

In my eTrex Legend HCx I can switch these layers on and off
individually. Some of the newer devices can't do this AFAIK. Would be
nice to know how the 30 behaves in this respect.