it's a learning process that takes time to perfect. I've been playing sh3 for about a year and i'm only just starting to learn how to plot courses.
The way I do it is when i'm submerged I take an observation (range and course) I then mark it down as best I can guess, I wait afew min then take another. From the two marks I measure them then use the nonograph to figure out speed
I draw a line connecting them then I have speed course and time to intercept
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