Summary: I bought this used and didn't get an instruction book, but was so easy to use, that none was needed. It takes a little while to find a tower and seems to give me the shortest route, not always the best route. Perhaps there's a setting I could change for that. Overall, I am happy with the unit.
Summary: I was very dissatisfied with my purchase. It would not stay on new settings that was programmed it kept defaulting to another state I assume the previous owner had programmed into it. Although this was a refurbished system, it was not in the shape as advertised when I received it.