Originally Posted by
Lonewolf_50
They were flying over the river, not the built up areas. Not sure how much time you have flying in a Blackhawk, but if you are over the water at night at 200' your radalt is giving you better indications of how far you are above water than your bar alt. If the two disagree, which one do you think you'll be using?
(Same is true in the Seahawk).
My recollection from the CW3 Roth (former 12th AB pilot) interview was he said the opposite; i.e., due to the frequent bridges/islands in the river, PAT25 would have been flying referenced to baro for route 1 and 4 altitude limits.