According to the manual:
1. Turn the eXplorist off.
2. First connect the PC interface cable to the connector on the back of the eXplorist.
3. Insert the USB connector on the PC interface cable to any of the USB ports on a personal computer.
4. Turn the eXplorist on.
5. You may get a message on your computer that a new USB device has been found.
6. If connected properly, the eXplorist will display the USB File Transfer screen, indicating that the eXplorist is in the file transfer mode.
If it isn't in the file transfer mode:
1. Press the "Menu" key.
2. Select Advanced Features
3. Select Communication
4. Select File Transfer
I don't see anything on the GPS to indicate it is successfully connected to the PC. However, the PC, when looking at the Windows Explorer (File Manager) will show a new drive. Also if you go to the Device Manager, look under Modems and it should show the Magellan. It won't show under com ports.