Hello all and thanks for the add to the forum. Being a total newbie to GPS's I really need some help with my Nuvi 1350. I have downloaded some maps (Thailand, Vietnam and Cambodia via garmin openstreetmap .NL) in preparation for a long bike ride thur those countries soon. I DL to laptop and then unzipped to a folder I created (named gmapsupp.img) in the Micro USB I installed in the GPS. When I double click on the individual map file I get a box come up saying "the archive is either in unknown format or damaged"

Can one of you gurus help this dumb bast__d please!! I havent got a clue.