This is a basic unit which is relatively easy to use. However, it is totally unreliable. My unit broke down three times in three years and, the last time, the rather arrogant people at Performance Products who make the kit, insisted on payment. They said it was now just out of warranty and even though they accepted it was unusual for a unit to breakdown so often they still insisted on payment for the repair. The so-called customer service people kept saying I was just unlucky - great thanks !! I'm off to Tom Tom Be warned