Do you mean "How do you work out the direction a stopped ship is facing?"
a) Have a look and note the bearing of the stopped ship
b) You know the heading of your boat.
c) On the chart, draw a line from your boat along the bearing of the stopped ship.
d) Have another look and you should be able to work out roughly the angle
("heading") of the stopped ship, relative to its bearing from your boat - the way it's
facing.
e) Estimate/calculate/"ping" for the range of the stopped boat
e) Draw a line on the chart indicating the stem to stern direction of the stopped boat
across the line of its bearing from your boat and at the calculated range.
That should give you enough to manouevre for a killing shot from an AOB of 90, or so.
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