Quote Originally Posted by spconner View Post
Tried merging with no luck. What would be nice to see is a 640 and how it is setup file structure wise, because that device comes from Garmin with both CityNavigator and Bluechart g2 preloaded.
No difference with 620! I often load the auto and topo maps in device and bluechart on SD or visa versa. It work only one way in all case - marine mode support only bluechart and in automobile mode the all map is available including merged!