"Morgans" wrote

Did you have a radar altimeter, or any other means of fine
tuning your altitude, other than barometric altimeter?

YES. And in the P-3 Orion, we had a "control wheel steering"
mode for the autopilot that would allow us to lock the altitude
hold function to the radar altimeter and just "drive" the ailerons
with the control wheel. Wherever you put the control wheel, the
autopilot kept it there. Controlwheel steering also worked for the
elevator axis if the altitude hold function was not engaged.

Bob