Originally Posted by Luke wl.
If I make a route in on the City Nav map, can I transfer it to the Topo?
Sure, you can switch to Topo in Mapsource, but it's not an autorouting mapset. So while you may see the autorouted view initially, the first time you recalc it will go to straight lines between waypoints, or via points.
If you load it into a GPS, it will be straight lines, unless you have an autorouting mapset loaded into the GPS.