29 knots works out to about 979 yards per minute, 16 yards per second. Round it off since precision doesn't matter that much, 1000 yards per minute. Got three targets, ranges 1500 yards, 2000 yards, 2500 yards, you fire at the farthest first then wait - how long? 500 yards is 30 seconds, so fire two at the farthest, wait 30, fire two at the midrange, wait 30 more, fire at the closest. Not gonna be exact since the targets are moving so the range is opening or closing, if they're closing (which they should be or you're in a bad attack position) shave 5 seconds off and shift targets every 25 seconds. Fire at 12:00:00, 12:00:25, and 12:00:50, then at 12:02:00 the first fish has traveled 2000 yards, second 1600 (ABOUT!) yards, third 1200 yards. They should all impact at about the same time. Within 10 seconds of each other is good timing, but within 20 works fine too, even 30 gives little time to react.
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