This adaptor angles the GPS at a fixed angle of 15 degrees, providing a much more convenient viewing angle. It fits in the same panel cutout as the panel dock, so if you already have a panel dock you can attach this adapter without having to modify your installation. You can mount the tilt adapter in either direction, in case you fly in the right seat. In addition, by using this adapter you can expand your installation options, since it lets you surface-mount the Panel Dock on any instrument panel.