From a friend….I believe the P-3 guys flew around 500' AGL (that's not missing a 0) when they were doing their sub hunting stuff
Dependent on profile.
Dropping a sonar bouy and stuff had a specific low altitude and speed requirement.
Not Sub Hunting
When they had their pattern out though they would go to a more economical loiter in the 3-5k range. It’s also where they spent most of their time doing non traditional ISR patrol with their cameras. And they wanted as little to do with skimming around low because that’s where the Seahawks would be doing their games.
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