Many coastal activities are influenced by the tides. Navigators, occasional boaters, but also fisherman, swimmers, surfers strollers or nature lovers seek information on the tide status (i.e.: high, low, flooding, ebbing, etc..). The most common way to find this information is to use a tide chart, to listen to local radio broadcasts or to read the local newspaper. Although precise, finding or extracting information is often tedious. Setup on a wall or inside a boat, the tidal clock provides a fast answer which is precise enough in most cases. If exact data is needed it is nevertheless a valuable complement to tide charts.
Tides follow mainly the lunar attraction. These clocks are based on a cycle of 24 hours, 50 minutes and 28,8 seconds. Why? While the earth spins in 24 hours, the same spot on earth needs to spin 50 minutes more to have the moon at the zenith again because in the meanwhile the moon moved forward 13 degrees.
Thus areas with semi-diurnal tides can estimate a high tide approximately every 12 hours and 25 minutes. The clock doesn't take care of the solar attraction.
So this method is not quite as precise as a tide table for certain stages of the "lunar month" (last and first quarters) but it has the enormous advantage of displaying the information at all times, without any intervention. It is also self-adjusting and can be used in the vast majority of areas with semi-diurnal tides.
Once started at the full moon high tide of your specific area, your tidal clock doesn't need any adjustment for the rest of the year. During the year, there will be some discrepancies with a conventional tide table. This is absolutely normal and you should not try to compensate by moving the clock's hand. The observed discrepancy is only temporary and will be automatically readjusted, partly or totally, a few days later, at either the next full or new moon.
Setting your tidal clock
1 - Set the clock hand to the "High Tide" position. To do so turn the small wheel on the back of the clock above the battery casing.
3- At that exact date and time insert your "AA" battery
4- That's it ! Wall orientation and sea vicinity have no impact on the tidal clock operation. All you have to do is to install your tidal clock where you want it. Don't forget only the brass edition is protected against humidity for aboard.
5- If you have problems finding the information in your area contact us, and we will be glad to help you set up your clock.
Your local situation
The dialer shows 6 hours to low tide and 6 hours to high tide. Local situations can be different. For example: about 8 hours to low tide and only 4 hours to high tide. This means that the sea level goes down really slowly, but rises very quickly. But in all the cases there will be 12 hours and 25 minutes between two high tides. So if you set your watch or clock to high tide, high tide will be always correct, and knowning the special rythme of your local sea, you will have your low tide somewhere 'around the 6 hours'!