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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. 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.

  4. Nautical chart - Wikipedia

    en.wikipedia.org/wiki/Nautical_chart

    The Medieval and Early Modern Nautical Chart: Birth, Evolution and Use, Lisbon-based ERC-funded academic project. They develop and maintain the MEDEA-CHART Database, a sophisticated search engine and aggregator of early nautical charts data. Online version of Chart No.1 with "Symbols, Abbreviations and Terms" used in nautical charts

  5. Light characteristic - Wikipedia

    en.wikipedia.org/wiki/Light_characteristic

    A light characteristic is all of the properties that make a particular navigational light identifiable. Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. Different lights use ...

  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. 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.

  8. Hella (company) - Wikipedia

    en.wikipedia.org/wiki/Hella_(company)

    Hella GmbH & Co. KGaA is an internationally operating German automotive parts supplier headquartered in Lippstadt, North Rhine-Westphalia. The company develops and manufactures lighting, electronic components , and systems for the automotive industry .

  9. History of navigation - Wikipedia

    en.wikipedia.org/wiki/History_of_navigation

    It is a circular planisphere drawn on parchment and set in a wooden frame, about two meters in diameter. The cross-staff was an ancient precursor to the modern marine sextant. "The light of navigation", Dutch sailing handbook, 1608, showing compass, hourglass, sea astrolabe, terrestrial and celestial globes, divider, Jacob's staff and astrolabe.

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