Montana 650T switching out SD's

[turbines]

I have the standard SD card that came with the unit. I want to get the OnX card for Wyoming but I don't want to foul up my unit by changing the cards.
If i do swap the chips does it mess with the programming? Will I be able to put the original chip back in without scrambling the montana 650t?

 

[FAIRCHASE]

It's not a problem to do so. I have a MT and ND chip that I swap out a few times each year. I do however turnoff off the internal/built-in maps for the 650T.

 

[turbines]

Thanx Fairchase, i will make sure and turn off the maps in the 'internal memory'