After spending many frustrating hours trying to get parallesl to work with my Garmin GPS 276C, I am giving up. An e-mail from customer support told me that Parallels does not work with many Garmin GPS and that they will not guarantee that future upgrades will. I am moving to VMware Fusion, a much more reliable VM software; It does not have issues with USB connection, it is as fast as my mac OS and does not have the tendency to crash. At this time it is in its Beta version but if this is any indication, it will become the standard VM. I am surprised that in this forum where there are so many people having issues with Paralles, I haven't come across many threads about this software. I own Parallels V3.0 and will sell it for half of the price to anyone who wishes to buy it. Pedro.