How do you go about downloading the Openstreetmaps into a Garmin?
Put a microSD card into your Garmin
Plug the GPS into your computer, you should see it as a removeable drive
Create a folder called "Garmin" on the microSD card (on my computer, the internal GPS memory is a drive called Gamin, my SD card is called "Unnamed")
Copy the .IMG file that you downloaded into that Gamin folder on the SD card
That should be it.

