I have a Trimble TNL 2000a GPS panel mount with cage, 2005 data card (updateable via Garmin), ext. antenna and manual. It works fine if you want to know where to point the plane and how long it will take to get there.
Put it in your plane or sell it on ebay and get some gas money. $50 + shipping. Otherwise, it will make a nice addition to the old parts display in the hangar.