Assumimg you have gwx installed you get a kmh to kts conversion chart that you pull down from the top left hand corner. You can use that to plot the position of the target hour to hour. Change course and speed accordingly to try and get ahead of the target with aob 90 degrees and fire away. Otherwise use a kts to kmh conversion tool or calculate it yourself. Then use the distance speed and time formula triangle to calculate any unknowns.
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KLt S. Cooksey commanding U-2528
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