I was one of the first 5510 and I did not like it at all. I ran it on the drivers side and a Garmin on the passenger side and they seldom agreed. But the Garmin used to say you have arrive and I was in the middle of a farmers field. The 5510 I put up with for several years and within the past two months it was stolen out of my coach, without the power cord. Then they came back and got the power cord. I am changing locks. Glennon Woods.