I am working with a Garmin Montana. What kind of map is advisable?

Quote Originally Posted by catymag View Post
As usual
Map with FID 4594 is for all the devices- presence of the digital signature (gma protection).
map with fid 1281 is for old devices :2XX 7XX
map with fid 1790 is for new devices ,is needed for buildings adress search
What is the difference on my Montana? Are there different map layouts and different information in it? Do they all look the same???