I usually wouldn't fire on a destroyer unless i had good data (surprise) or if it was a zero-gyro shot (down-the-throat). But for taskforces, and fast moving BBs, CLs, CVs, I take a guess. I get as close as possible, assume they travel at about 20kts, and fire a spread. Especially with fast T1s, when you are at short range,the error in your speed estimate is not that big a problem. Also, I try to remember the first contact report because it declares the TF's speed.
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