Thanks for the help.
I am using an Explorist 500 with the Vantage Point software. The magellan site state that it is compatable.
When I click on MyGPS, the sync bottons are grayed out and I cannot click on them. I have also discovered a "Load GPX File to my GPS" link under the round VP logo in upper left, but that is grayed out also. If this were a driver issue, I would think that the links would be active, but I would just not be able to complete the data transfer.? Vantage Point recognises my GPS when it is in the USB file transfer mode.
I sure hope I can get this program to work. Since I've switched to Windows Vista, I can no longer get the original Magellan Geocache Manager to work, even after loading new drivers. I'm glad I've got 2 XP machines to keep me Geocaching!