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the international community agreed on the definition of 1 international nautical mile as 1852 metres, which is roughly the average length of one minute of latitude i.e. one minute of arc along a line of longitude (a meridian).
Or to put it shortly: 1 nm = 1' 1.1508 mi 6,076.1 ft |
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| a floating aid to guide sailors along the safest routes |
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added to lighted aids to make them more visisble during the day. they are usually red trangles or green squares |
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an unlighted structure fixed to the bottom. It can be located on shore or in water usually up to twelve feet in depth. |
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Fix is the initial element of the ship's navigational and dead reckoning (see below) plot.A fix is the ship's position on the earth at some given point in time. A fix is determined by the simultaneous intersection of LOP's |
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| Dead reckoning is a technique to determine a ship's approximate position by applying to the last established charted position a vector or series of vectors representing true courses and speed. This means that if we have an earlier fix, we plot from that position our course and 'distance travelled since then' and deduce our current position. |
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