Buying a new Montana 650T - Can I use unlocked maps????

Hi folks.
I'm new to Garmin and handheld GPS..

I'm about to buy a Garmin Montana 650T tomorrow.

I would just like someone to confirm I can use unlocked maps on it???

thanks for any help....

of course! why not?

I have no idea, but I thought I should check...

Thanks p!xeldealer