Al-B,
Not sure but did I not read somewhere that the GPS was used for the hover. It would be better than the doppler, which on the BHL S61s, used to see the winchman and chunner off in what ever direction it felt like.
It was proposed that GPS was used years back but kicked into the long grass due to the fear of jitter having the same effect.
Talking of jitter has anybody ever seen or had the GPS run away due to jitter? Can't say I have but maybe I'm lucky or my attention wandered.
