I can visualize using the compass to create the 2 circles or using the ruler to create an intercept position.
A certain amount of plotting would still need to be done from the radio information.
Time first reported.
Time now.
Contacts speed.
Contacts course.
Using the compass or ruler you can estimate where the target is likely to be at anytime by measuring time-distance-speed.
Taking the same actions with your sub theoretically you would meet where you cross each other.
At some point you should be able to get a more accurate plot by diving and getting a sonar report and adjusting your position to the contacts position accordingly.
Peter
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