During one of my flights as a CFII my student took a LONG time setting up an ILS approach, and we were not yet talking to ATC....on of the dreaded pop-ups!!
Anyways, I was on the controls and decided to do some OGE hovering at 2100' while my student did his bit, he got on the horn to ATC and they gave us a squawk code. They could not find us on the radar although we told them exactly where we were. Still hovering I figured we would try to move, and as I passed about 30 KIAS he got radar contact.
Was that all just coincidence, or can we go stealth just by stopping...some kind of doppler effect?
300CB, no doors