Ah; I see what you mean.
I don't use the predefined search waypoint, no. What I do, (and what I suspect most people around here do) is cruise about in places where it seems likely that shipping might happen by. Every now and then, I submerge, stop the boat, and take a manual hydrophone check.
I repeat this process until I'm low on fuel, torpedoes, or patience.
I tend to try to cruise <i>along</i> likely sea routes, on the notion that I'm more likely to encounter shipping that way. Others may have other ideas on that score.
The automated search pattern would just send me back and forth through parts of the ocean where I have no personal reason to think shipping is likely.
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