Traditional marine instrument
Tide Clock
A conventional clockwise tide-phase clock for a coastal location you choose — even when the phone is hundreds or thousands of kilometres away.
How to read it
The hand moves clockwise, like an ordinary clock. HIGH TIDE is at 12 o'clock and LOW TIDE at 6 o'clock. On the left side the tide is FLOODING / RISING toward high tide. On the right side it is EBBING / FALLING toward low tide.
The Tide Clock has its own location
The location printed on the Tide Clock face is independent of the Barometer reference location. You can live on the prairies and keep the Tide Clock set to Halifax, Esquimalt, Marsh Harbour or another place that matters to you.
Setting the Tide Clock
Use the nearest known high or low tide from a reliable tide table. Enter the tide location, whether the reference is HIGH or LOW, the local date and time of that tide, and the location's UTC offset for that date. An optional phase trim provides a small manual correction.
Once the reference time is converted internally, moving the phone to another timezone does not change the tide location being displayed.
What it is — and what it is not
Marine Barometer's Tide Clock is intentionally a traditional fixed-period tide clock. It uses the principal lunar semidiurnal period of about 12 hours 25 minutes. Real tides are affected by additional lunar and solar constituents, local geography and weather, so a conventional tide clock will gradually differ from a published harmonic tide prediction.
For best agreement with current conditions, reset the Tide Clock from a nearby known HIGH or LOW tide when accuracy matters.