Motoreiter
Assuming you have a Garmin Montana - this procedure only works if you have that model of gps.
If you already have downloaded the image (gmapsupp.img) from OSM
- Create a folder on the micro SD card called garmin
- Place the image inside that folder
- Put micro SD in the Montana
- Start Basecamp
- Connect your Montana to your pc and wait a bit
Your pc will first recognise your Montana connected via usb port
then Basecamp will 'hear' the Montana and the map will become visible being imported - look at the green progress line on left hand side in Basecamp.
tip: you can rename the gmapsupp file to the name of the country/ies the .img is made up of- This new name will be visible on the Montana to help select/deseect but it revert to OSM worldmap in basecamp.
Whatever you rename the gmapsupp image, do not rename the extension ! the .img is for the benefit of the electronics not for the nut who connects the saddle to the handlebars!! 
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