Why can't I select the USB Link as the interface in Compass GPS?
Ensure that the USB Link drivers have been installed. [Please see "Installing USB Link" guide]. Once the drivers have been installed, plug the USBlink into the computer. Next, open Compass GPS and go to the Session Start screen, then select Compass Setup under the More Tools menu on the left navigation panel. Select the Interface tab. Locate the USB Link under Available Interfaces, and click it once to highlight the USB Link, then click the Add button. Once it is in the Current Interfaces, click to highlight the USB Link, then click the Test button.