Looks like a great trip! What Gps software are you using in that screenshot?
I'm using Delorme's TOPO North America Version 10.0 (~$85) but you'll need a GPS antenna. (USGlobalSat BU353-S4 USB GPS Receiver ~$35). I'm pretty happy with the setup as it has provided me with the ability to navigate when cell phone nav fails. However, I might consider 'upgrading' to some type of tablet as the laptop takes up space.