


But ask Garmin to be safe-I could be wrong. If you get CityNav on an SD card, I don't *think* this database can be loaded into your computer also and used with Mapsource to create/download routes. SD map, only one could be loaded into the unit at any given time.Įdit: I re-read this and maybe now I understand what you're asking. The rest of your question, not sure what you're asking.? If you bought a Topo SD map and a City Nav. maps (loaded onto an SD card) contain the street level/etc maps and provide greater detail, as do the Topo maps. The built-in "basemap" shows only major highways the City Nav. However, the way the routes will *display* (the amount of detail) is dependent on the level of mapping software installed on the unit. If you create a route on your computer, you can download it to your unit, even if there is NO SD card installed, as the routes are stored in the built-in memory of the unit, and should work fine regardless of what type of additional mapping is installed. Routes are a separate function from detailed maps.
