Hallo Contact!
You can get a ship's course or a convoy's course by marking its position on the navigation map for a period of time. You should be able to determine this period of time on your own, there are no fixed solutions. I follow my target, at the edge of the visual range, and mark its position at 4 or 5min intervals for a distance of about 25km. Then i get the course the way you describe.
There is another way of doing this, specifically when the target is a convoy. First, mark its position on the nav map. Follow the convoy for about 25km or more and mark its position again. Find the course by using the protractor. So,
- If you get a radio contact report then you have the 1st mark. You can then plot an interception course which will bring you in front of the convoy just outside the visual range. Then, another sighting is all you need.
- If you get a second radio report then you have the 2nd mark.
-A sighting will give you the 1st mark (i.e you spot the convoy).
Follow it and you either mark its position every 4 or 5 min or take another mark after 25km.
Thats what i do. Also, you should not expect to find the EXACT course. Your calculations will give you a course which differs from the exact course by 1 or even 2deg. If you want to practice then, after getting the course, send a message to BdU to radio the convoy's position. This way you can verify your calculations. But when playing your real career, this is cheating. Its all up to you.
