I have the Garmin RV760 and it has done some strange routing at times. I found that you have to be very careful about selecting avoidances. It takes you very seriously. I was once sitting in a gas station and needed to find a Walmart so I selected find near me. It did and took me 3 miles around the block to a store a 1/4 mile behind me because I had avoid U turns ON. It does not know your in a parking lot and can turn around it only knows your facing North and need to go south. After that I always zoom out to find my final destination before I move. It has taken me off the main highway and had me cut a corner on a secondary road to put me back on the same highway. It always ticks me off but I follow it because I dont know if there is a tunnel that prohibits propane or something else that my RV could not get through. But you do have to be careful if it tries to route you onto a gravel road as my car GPS has done but never the 760.