Gary Emerson wrote:
...Cessna 182RG orbiting ... constant ~3 minute
turn rate over a fixed spot for several hours straight...

When that was happening over Lodi CA, it was Northwest Aircraft Leasing
Corp. of Delaware doing surveillance for some government agency:

http://www.infowars.com/articles/bb/..._over_lodi.htm

http://www.freerepublic.com/focus/f-news/1433330/posts

They were based out of Hayward, CA, about 100 mi distant. Word is they
were collecting satellite phone traffic, but that's probably just
rumor.

Bob K.