Originally Posted by
BFSGrad
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.
And I forget who, but there was mention of RADALT varying with the depth of the water.