catymag: I guess that means that the maps are OK and the problem is with my GPSmap 62s or me :-(

fluorescent: My GPS came with the Worldwide DEM Basemap, NR installed on internal memory. I have tried with this enabled and disabled without any success.

I have just put the Lake District img on the internal memory (\Garmin\GMAPSUPP.IMG) with Discoverer GB and OSM img files on the SD card (also in \Garmin). GPS only shows basemap as being available. If I delete Lake District then GPS shows basemap, Discoverer and OSM ans being available (only basemap is enabled, but I can enable/disable the others). It (the GPS) obviously doesnt like the Lake District map.

catmag: What firmware are you running on your GPSmap 62? (mine is 2.80).