Trouble using img maps in Basecamp 4.7.4

It used to work with previous versions. I can no longer make it work. I'm putting the img files in AppData>Garmin>Maps> as instructed. The maps I'm trying to use are from Open Topo Maps. I've used Open Street Maps before in the past with no issues. What gives?

0 SUSSAMB over 3 years ago

BaseCamp never has read .img files like that. You need either a physical or virtual removable drive with the .img files in a folder named Garmin

Some OSM maps come with an installer allowing them to be installed to a c drive for BaseCamp to read, that would have been how you did it previously.