I believe there are no false echoes in SH4. If you are not presently detected, escorts circle the point of last contact. If contact is not reacquired in 30 minutes they leave and resume escort duties..
Actually that is the basis of my convoy attack strategy of attacking from one side of the convoy and shooting from long enough range (between 1500 and 2000 yards) on the first shot to turn tail and run away. The escorts come from both sides of the convoy to kill me but I've already turned tail and am out of there.
They will circle for a half hour, giving me time to do an end around to attack the weakly guarded side of the convoy. This time I'm getting in close and doing some guaranteed big time damage. Then I pull out and end around to the other side for my next attack.
I've stripped entire convoys of their merchies that way and left the escorts to just steam away because they have no one to escort.
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