Once you get the target course, you have all the information to set up an attack angle.
In order to set yourself up for that attack, is getting in front of the target, and having enough time to set your boat up for the attack. You need the target speed to get there.
So if your target is traveling 5 knots (1knot = 1.852 meters), then I know in 1 hours that target will travel 9.26km. I can adjust this number for 2 hours, 4, 48, and so froth. So if i want to be in front of the target, within 1000m close to it, taking into consideration the time of day, how far I am currently away from the target, if I have to at some point submerge, then I can determine how fast I need to go.
Just hitting Flank speed is great, but I want to travel economically, and get in front of this target without waiting an hour for it to travel to me. I cant go too slow because I need to get far enough ahead to set my attack up. I will make that my next video.
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