Danny Deger wrote:

It turns out my mystery lake was new and not on the maps yet. My map was
current. I swear it was. I never use out of date maps. That's my story
and I am sticking to it :-)

Anyway I was where I thought I was, but very concerned for a while when I
saw that damned lake under me that wasn't supposed to be there.

A new LAKE? That's pretty big for a "new" thing.

I wasn't airborne, but roadborne with a satnav trying to get from Point
A to Point B in a new city, and was tooling along a massive divided
four-lane when suddently, the GPS started trying to U-turn me. Turned
out that the road was newer than my data...the navigator thought I was
going off-road for a good half-mile.