I have a Zumo 550 and am having trouble with it loading a trip. I get this message when I say "go" for the route I created in basecamp. Its a 4500 kms trip. Now right now I have the 2009 maps still on the Zumo, but have the latest 2012 update completely on an SD card. Is this problem being caused by the Zumo itself being full? Would getting rid of the 2009 maps clear this problem up? If so, how do I safely delete the 2009 maps but keep everything else in tact?