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2. Tide clock - Wikipedia

   en.wikipedia.org/wiki/Tide_clock

   When the clock reaches the halfway point ("half-tide"), it then counts the hours up to high tide or low tide, as in "one hour until high or low tide". Generally, there is an adjustment knob on the back on the instrument which may be used to set the tide using official tide tables for a specific location at either high or low tide.

3. Nautical time - Wikipedia

   en.wikipedia.org/wiki/Nautical_time

   Nautical time divides the globe into 24 nautical time zones with hourly clock offsets, spaced at 15 degrees by longitudinal coordinate, with no political deviation. Nautical timekeeping dates back to the early 20th century as a standard way to keep time at sea, although it largely only applied to military fleets pre–World War 2.

4. Marine chronometer - Wikipedia

   en.wikipedia.org/wiki/Marine_chronometer

   A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

5. Tide dial - Wikipedia

   en.wikipedia.org/wiki/Tide_dial

   A tide dial, also known as a mass dial [2] or a scratch dial, [3] [4] is a sundial marked with the canonical hours rather than or in addition to the standard hours of daylight. Such sundials were particularly common between the 7th and 14th centuries in Europe, at which point they began to be replaced by mechanical clocks. There are more than ...

6. Tidal atlas - Wikipedia

   en.wikipedia.org/wiki/Tidal_atlas

   To calculate the rate at an intermediate tide between neap and spring, interpolation is required. Traditionally this has been done using a "calculation of rates" chart found inside tidal atlases. [5] An alternative to a tidal atlas is a nautical chart that provides tidal diamonds.

7. Time ball - Wikipedia

   en.wikipedia.org/wiki/Time_ball

   Royal Observatory, Greenwich, London.Installed in 1833, a time ball sits atop the Octagon Room. A time ball or timeball is a time-signalling device. It consists of a large, painted wooden or metal ball that is dropped at a predetermined time, principally to enable navigators aboard ships offshore to verify the setting of their marine chronometers.