I installed the latest version of BaseCamp 4.6.3 on my iMac El Capitan 10.11.6.
I have down loaded the Idaho top map. However, when I go to File>Import on BaseCamp and select the Idaho topo I get an advisory saying it is not valid.
I want to load the map into BaseCamp and then my Garmin HCX.
Thanks You.
Well I installed Mapinstall and got the Idaho top to load. I then selected the area I wanted and successfully loaded in onto my Garmin etrex HCX