GWX 3 convoys do have waypoints that make them zigzag in a random sequence. So, it doesn't necessarily mean you have been detected. They just do.
I can't say that I have a solution to this. I never really did experience the radar-age in the game. But to make best use of your speed underwater while already in front, is to put the target on your 270/90 bearing and use whatever speed you can muster. But yeah, it will drain the battery.
Can you maintain visual contact from a far distance, despite radar? If so, look at the AOB, and just keep shifting sideways until it looks 0. Then mark a line from your position to them. And reposition further along it's extension to lie in wait for the attack. I guess as soon as possible so they don't zigzag again.
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