Nautical Chart Position

Position on a nautical chart

Charts our position on them

Latitude and LongitudeA position on a chart is given in latitude and longitude It may sometimes be expressed as a range and bearing from an object however its geographical reference will always be in latitude and longitude (Often abbreviated to lat & lon) If you look along the sides top and bottom, you will see that the chart is bordered with a black and white graded scale This scale relates to an imaginary grid we superimpose over the surface of the earth in order to reference our position This scale is marked in degrees and minutes Purism: The Latitude of a place is the Angle subtended at the centre of the earth between the place and the equator and is measured in the plane of the meridian through that place
The longitude of a place is the angle subtended at the centre of the Earth through the meridian at that place and the Greenwich Meridian, measured in the plane of the Equator Latitude and Longitude

X marks the spot:

Horizontal lines extending from one side of the chart to the other are known as  Latitude 
Vertical lines extending from the top of the chart to the bottom are known as Longitude Where any given position in latitude and longitude dissect each other on a chart, that intersection or cross marks that position on the chart
So now:
If were given the Latitude and Longitude of a position, we can plot our exact position on the chart
If we have a position or location on the chart, we can find out its exact position in Latitude and Longitude

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Understanding Nautical Charts Our Position