installed 3.0.4 .
Reading a gmapprom and gmapprom1 (nuvi775) seems to be working:
* Added ability for BaseCamp to attempt reading all Garmin map images (.img files), regardless of name, from removable media.
A gmapsupp.img on a sd card (and internal) is not recognized by BC.
Installed a topo Garmany 2010, with is not installed already on my pc.
Tested also on a dakota 20, no luck eather.
Was this function disabled in 3.0.4 (introduced in 3.0.3).