Originally Posted by DRTBYK
Wow, we seem to be all over the place on this topic.
Strait answer to your question is, yes, you can have a mixed (on/off-mapped road) routes and send it to the Montana but you'll have to have the exact same map set on the Montana as MapSource or BaseCamp did when you created the route (and yes, you can make mixed-routes in BaseCamp). Just have to remember to set Recalculation to OFF when you navigate your mixed-route.
Example of Mixed-Route created in BaseCamp on 24K US North Central Topo:
Base camp for windows ?
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