I agree with Matt_Colie. All GPS units make 'mistakes'. Part of the reason is updating. Since we carry the 'RV' gps in our coaches, we fail to update on a regular basis. It is important to connect your gps to your computer, go to the mrgs website and look for updates.
I have been using Magellan since they first came out and like the way they operate. I have the 9615-T in the coach because of the 7" screen, and one of my smaller models in the car for when we sightsee in the dinghy.
Happy Trails! ;)
Darryl