I picked it up from West Marine, mainly on a lark that I could use the maps to activate some of the old lifetime update cards that still exist. In any case, West Marine has a couple of copies still in the original packaging. Just old stock.
I've got the 2018.10 version on my Nuvi LM and , therefore, Basecamp. I've been using it to plan routes for an upcoming Trans-America Trail motorcycle trip. With few exceptions the trails and dirt forest service routes are all on City Navigator. In fact there is only one segment of the original route that isn't rendered wither in CN or the OSM Topo map for that area. That has made routes usable, which for me is preferable to tracks. I miss fewer turns that way.
In the end it will likely be cheaper just to get a "current" non-updatable copy of CN NA from Garmin just for the Montana. I am also trying to ensure I have map data for the whole route on there. I think my earlier efforts at cramming in OSM Topo data has exceeded the limits the Montana can handle - but I may just be loading them inartfully.
I've got the 2018.10 version on my Nuvi LM and , therefore, Basecamp. I've been using it to plan routes for an upcoming Trans-America Trail motorcycle trip. With few exceptions the trails and dirt forest service routes are all on City Navigator. In fact there is only one segment of the original route that isn't rendered wither in CN or the OSM Topo map for that area. That has made routes usable, which for me is preferable to tracks. I miss fewer turns that way.
In the end it will likely be cheaper just to get a "current" non-updatable copy of CN NA from Garmin just for the Montana. I am also trying to ensure I have map data for the whole route on there. I think my earlier efforts at cramming in OSM Topo data has exceeded the limits the Montana can handle - but I may just be loading them inartfully.