Garmin/OnX question

Joined
Jan 14, 2019
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Location
Texas
I bought the OnX elite app for my phone/computer so I would have access to maps of all the states. Now I purchased a Garmin Montana GPS, and I’d like to use the onX maps on that. The only way I can see going about that is to buy all of the state chips for $120 a piece. Am I missing something? Can I just buy a microSD card and download the onX maps onto that?
 
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