I comment bout Navroute for loosing signal all the time compare to my garmin and once I also did a try out of Radioshack's serial Gps which was discontinued
both of them works perfect always got 10 lock sat, today I baugth a usb hub just find out that power adapter was not included , went to Ratshack but coudnt find 5 volts so i grab the 6 volts and pray, My Gyro Mouse and KB works
fine check the Navroute GPS I was surprise usually i got 7 sat lock but today got 10 and never lost signal for 1 1/2 driving since its magnet mount and waterproof i installed on top of the roof and got better result.
www.navroute.com to those who wants to try