This tide clock gives you a simple & convenient guide to tides. It has been designed to synchronise to the lunar cycle, it rotate twice each period giving you a quick & easy indication of high & low tide so you can plan your seaside & sailing activities according to the tide. Set in a powder coated steel frame with a glass face & 4 decorative symbols. It can be hung from the side of the house, wall or fence. To set your tide clock, check your local tide table, & move the hand round to the correct position, the clock will automatically to the rest. Instructions are enclosed.