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2. Nautical chart - Wikipedia

   en.wikipedia.org/wiki/Nautical_chart

   A nautical chart or hydrographic chart is a graphic representation of a sea region or water body and adjacent coasts or banks. Depending on the scale of the chart, it may show depths of water ( bathymetry) and heights of land ( topography ), natural features of the seabed, details of the coastline, navigational hazards, locations of natural and ...

3. Nautical mile - Wikipedia

   en.wikipedia.org/wiki/Nautical_mile

   A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute (⁠ 1 / 60 ⁠ of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).

4. Portolan chart - Wikipedia

   en.wikipedia.org/wiki/Portolan_chart

   Portolan charts are nautical charts, first made in the 13th century in the Mediterranean basin and later expanded to include other regions. The word portolan comes from the Italian portolano, meaning "related to ports or harbors ", and which since at least the 17th century designates "a collection of sailing directions".

5. List of nautical units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_nautical_units_of...

   Nautical mile: Length: Rhumb: Angle: The angle between two successive points of the thirty-two point compass (11 degrees 15 minutes) (rare) [1] Shackle: Length: Before 1949, 12.5 fathoms; later 15 fathoms. [2] Toise: Length: Toise was also used for measures of area and volume Twenty-foot equivalent unit or TEU: Volume: Used in connection with ...

6. Admiralty chart - Wikipedia

   en.wikipedia.org/wiki/Admiralty_chart

   Thus the chart coloration gave a clear indication to users as to whether they were using a chart with depths in fathoms or feet. While depths and heights were in metres, the nautical mile continued to be an international standard. Derived from the length of 1 minute of latitude, it is defined as 1852 metres.

7. Sailing Directions - Wikipedia

   en.wikipedia.org/wiki/Sailing_Directions

   The numbers in the squares indicate the individual Planning Guidecoverage areas. Sailing Directionsare written directions that describe the routes to be taken by boats and ships during coastal navigation and port approaches. There are also products known as Sailing Directions, which are books written by various Hydrographic Offices throughout ...