In actuality, there is a true science behind it, the same goes for my catfish calendar. In trying to explain it in the simplest manner possible, it has to do with magnetics & instincts. Animals, including fish, are affected by certain magnetic fluxes and fields. Recent satellite findings by watching cattle graze, is that they feed in a north/south pattern (either way), but the group indicates the pattern. Scientists are now studying, don't understand it, but realize it has to do with magnetics.

Here is a snip touching on it:
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In a new study, physicists have investigated the role of quantum interactions in magneto-reception, and have shown that quantum technologies could be used to enhance or reduce the performance of an animal's chemical compass, and potentially control other biological functions.

Many animals possess some kind of magnetic sense, allowing them to navigate by using a magnetic field. The ability to detect a magnetic field, called magneto-reception, has been observed in a variety of animals, including birds, turtles, sharks, lobsters, cows, fungi, and bacteria. However, scientists do not fully understand the mechanisms responsible for this ability.
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Ron had a watch like this & did fairly good with Crappie.