Quote Originally Posted by tiger555 View Post
One more thing... If you have multiple versions of a map installed, enable only one at a time. Otherwise, they will not work correctly. For example, if you have both "CNNA 2012.1" and "CNNA 2013.2" installed, select only one at a time because they cover overlapping geographical areas.
I think this occurs automatically, personally verified with CNEU NT. If you mount a more recent version of the same Map (same Map family), this one overlay the older one, for the corrisponding coverages