1:24K-equivalent topographic maps for Montana in the Garmin .img format are now available from miscjunk.org, also the source of topo maps for Colorado, Wyoming and Utah. Installs in MapSource.
MiscJunk is working on a set for California, but there’s one available now here. This is a 1-GB plus gmapsupp.img file that will have to be copied directly onto a 2-GB or larger microSD or SD card (depending on the Garmin model); it won’t fit on models that have built-in memory.
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