Offshoreigor - RW-1 is making a visual approach at night to a fixed point (presumably illuminated) so if he flys the LS in the same position in the windscreen and achieves speed v height gates - he will always fly the same approach (providing he is always approaching on the same heading. Trying to maintain minimum safe autorotative speed on a night approach would most likely end up with a quickstop to the hover with all the attendant problems of loss of references as the landing lamp shines upward due to the flare and ground proximity cues are lost completely! Frankly any kind of AI or AH would be better than nothing especially at night over the water - I have scared myself many times there even when I have had an AI to help me!