I keep wondering about ADS-B coverage--or in my case, the lack of it. This morning, for example, I flew 1.5 hours, but FlightAware "saw" me for only about 3 minutes of that time. That was GOOD--it didn't see me at all in the previous three flights. But the interesting thing is that for this flight I had the 740's Ghost Traffic filter turned off, and the only time I saw a ghost was during the same period that FlightAware tracked me.
I'm turning that filter back on, though. It's too spooky, seeing traffic displayed so close.