I haven't installed the stereo or UHF yet, but here's where I've put my GPS. I've hard-wired an Icom OPC-254L power lead into the constant 12v socket in the dash, so I can power either my Uniden GNS8360 (for onroad use) and my Uniden GPS501 (for offroad use). I wanted a stealth-install rather than use the supplied 12v ciggy-plug lead. The top tray's lined with heavy-duty velcro.