I am still very new to this, I have searched everywhere in the Garmin FAQ , but MY problem is, I load the City Nav 2008 on my unit and it works fine, then I load the topo maps 2008 on, and I loose some if not all of the City Nav data like address search. so I reformatted an started over, loading topo first, then City Nav, then the topo data is not available. But I still have no luck. I found map set up , the FAQ says you can select map, but the Topo does not even show up on the list. What am I doing wrong?
It seems like what ever map I load, overwrite the first download.
Thank you for the help, as I want to use the unit Geo caching and city navigation when I travel.