Has anyone used the Garmin Mexico in a 2720? Does it fit memory wise[or do you have to take out some of the existing]? The Garmin site has it as a disc or sd card, but I don't think mine has a sd card[I have only had it a month or so, so sorry for the stupid questions] I want to go from Mn. to Puerta Vallarta . Is it worth the $100, or is there a better option? I do have a paper map, but it is very nice to have the turn by turn on screen.