OpenStreetMap
Has anyone ever succeded in combining two garmin compatible gmapsupp.img maps into one, so the two can be selected as layers on the divice without the need of a PC to change/rename files on the SD card?
I like to use the raumbezug OSM map for Garmin for in car routing, but also the hiking maps for, well, hiking. It would be really cool (and should be technically possible) to change between the two on the fly.
So can anyone help? How to combine both into one gmapsupp.img?
Discussion
Comment from Mezzanine on 16 March 2010 at 15:42
Yes; there's some related info here http://wiki.openstreetmap.org/wiki/Topographic_maps_for_garmin_devices#Combining_the_data
The process is similar if using gmappsupp files; essentially you need to ensure that the family name/ID of the map tiles in one gmappsupp are different to the name/ID of the tiles in another gmappsupp. You can use gmt to query the details and alter them as necessary. You can also use gmt to join them together. On your garmin (I have an eTrex Legend), go the the setup->map setup page. Move across to the option where you can select individual tiles to display and then (and this is the important bit) hit the Menu button. The popup menu allows you to selectively show/hide whole map families within your combined gmappsupp. I only recently discovered the whole family show/hide option, previously thinking that the only way to achieve this was to tick/untick each individual tile img.
Comment from giggls on 16 March 2010 at 15:56
Can be done using gmatool not free Software but free as in beer