I have a Zumo 550 that has served me well for many years. I am preparing to do part of the MABDR. The BDR routes are distributed as tracks and they don't recommend converting them to routes in order to preserve accuracy. It has always been my understanding the the Zumo 550 doesn't support tracks. When I send the BDR tracks to my 550 is it automatically converting them to routes? If that is the case, can anyone comment to the loss of accuracy?