WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the ground cable from the battery.
Remove the clip, and remove the center upper panel.
Fig 1: Locating Center Upper Panel Clip
Remove the display mounting screws.
Fig 2: Locating Display Mounting Screws
Disconnect the harness connector and remove the navigation display.