Doesn't seem reasonable at all. Let's take two targets, one traveling 5 knots and the other traveling 15 knots. Now, since lead angle is proportional to speed, we know the lead angle for the 15 knot boat should be three times as large as the 5 knot boat.
However the formula says 5+3=8º for the slow boat and 15+3=18º for the fast one. 8x3=24, not 18, so I'm calling bull on that one. And of course it takes no account of enemy course relative to your own. That alone makes the rule invalid.
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