I am trying to load additional map files onto my Oregon 450. I have read numerous posts that state that any_name.img should be recognized as a distinct map by the 450.
I have used Basecamp to download two different map sets (NW topo and NW trails) to the 450. Both download OK and both are named, by Basecamp, gmapsupp so they overwrite one another. When I change the name (I am opening up the SD card on my laptop, opening up the garmin folder and re-naming the file) from gmapsupp to anything else (I've tried gmapsup1, gmapsupp.img, etc., etc.) the file is no longer recognized by the 450. It appears as if I can only have one map file downloaded from basecamp. I have other .img files on my SD card (i.e. ibycus topo 3.2.img, gmapsupp Eng) these show up nicely and these allow me to change the name and still work.
Am I doing something wrong?