... since the "low tide" is wherever there is no high tide. The reason is simply that the water used for building up the "heap" that follows the gravitational pull of moon and sun has to be amiss elsewhere, which is causing the low tides in all reagions that are facing neither the sun nor the moon (or the opposite sides, where the centrifugal force is strongest).
However, one has to keep in mind that tidal changes and there predictions are a science in itself. Trying to depict this by a menchanical wristwatch must result in a more playful than serious instrument.
Marcus