Originally Posted by
CaptainMidnight
In that Class E airspace, how extensive is the FAA's surveillance coverage? Does it go down to 1200 AGL or lower?
The majority of the Continental US has very good radar coverage down to pretty low altitudes. There are areas of Alaska and some of the mountainous Western State where the coverage is not as good. But for most of the US, operating IFR outside of Radar coverage is something Earnest Gann used to do.