Programming/design flaws aside, it doesn't take much time to do some speed runs to determine fuel consumption rates at various speeds. And to do the same for battery usage. It's a good way to stay busy during the voyage out to your assignment.
The results are useful, not only for predicting patrol range, but also being able to answer questions like whether I have the charge to try, while submerged at flank speed, to intercept a target. And then how much will I have left if the escorts start hassling me and I have to stay under.
I am currently pursuing the Midway task force, which I ran across while coming back from a patrol. I know how long I can go at flank speed before I have to give up and let them go.
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