I bought a Cessna 206 that had this in there and I changed it out for a new one. It seems this one actually was from another plane prior and the shop that installed it did not properly register it. It as also located far to the right of the panel and I wanted one in the center. Anyway, we fixed my issues by giving the plane some Garmin upgrades and this was one item we replaced. 

If this arrives, you install and there are any issues, I will accept a full return. I'm including insured shipping to you but I won't pay for return shipping - eBay is already going to collect fees. So the most you are risking is shipping. As I said, it was functioning, but I wanted to stay Garmin consistent in my panel.