Quote:
Originally Posted by Dantenoc
If it is an important contact (like a convoy), you should receive radio updates informing you of any change in course and speed, allowing you to adjust your calculations... If not, then there's nothing you can do about it, so why worry? just shrug it off 
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Yes, that is true and in all of my career so far (1939 to Oct 1942) I have never had a convoy change it's course. I just wanted to learn a simple method on how to use the nav map tools when I started this post.