K-Star, thank you for the reply. I also posted this question on the poifactory site and received a reply. They said Magellan was purchased by a Chinese company a few years ago and Magellan units no longer allow information to be downloaded to the units. So I must live with what is on the unit.
As a side note I read that MSN Direct will no longer be available after Jan 1, 2012 for Garmin updates.
Disappointing news on the Magellan units. I was hoping to add the height clearance info to our Magellan unit instead of buying one of the newer RV/Trucker units for that feature. I've read such negative feedback on the RV/Truck units that I am afraid to get one and be less than satisfied with the performance.
Thoroughly confused at this point as to what to do!