The user manual is well written and on our first trip, I sorted out how to use the navigation system. The trip from our home to the end destination in Murfreesborough, NC took about 2 and 1/2 hours (distance 142 miles). The vocal instructions were very accurate and we reached our destination without any problems.On our way back home, the GPS apparently lost all satellite signals (about at exit 289 on I40 NC) and we were informed to drive to the nearest road. After a while, our position was re-established and the turn by turn instructions were very accurate.We found that whenever we deliberately took another route, the NAVMAN could quickly re-establish our position and guide us to the chosen destination.The touch screen is easy to work with and most of the menus are intuitive. For it's price, I consider the Navman F20 a good buy. The manufacturer could however, have added a stylus (for tapping on the screen) as part of the package.