I am running street atlas 2004 and a magellan GPS on the serial port and it works perfect. It always shows me on the correct street, no problem there. What I realy do not like is the fact that it does not scroll smoothly, it waits until you are close to the top of the screen then it moves the map down half a screen. Sometimes if your turn is just off the screen you may miss it because by the time it moves the screen you have past the exit. It knows your speed from the GPS but when it calculates your ETA it does it by the speed limits that are set for each street you have to travel on. So sometimes it says "left turn ahead 1/2 mile, 60 seconds away" and you are going 45 MPH. Its a bit off. I heard Routis works really well, but I do not want to buy another software without testing it first. So far I bought Street Atlas 2004 and MS Streets & Trips 2004 and they both kinda suck. So if anyone knows anything about routis please let us know if it works well!
Steve