No, is one of the more useful things when you get a contact report, many times i could intercept convoys thanks to this chart.
Convoy report tells the hour and minute and speed, i plot an intercept course and, and ask how much time the sub will be there so. If i get there in 10 hours. Then i look at the chart and see how many distance they travel in 10 hours and adjust the plot. You get a good idea where the convoy will be.
Then suppose you get there and calculate the distance drawing a circle again, if the convoy passed your position you missed it but you know the distance from the start point all the time more or less! and try to intercept again.
Sorry for my english, i can't explain better.
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