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A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 m), ... navy redefined the shackle to be 15 fathoms (90 ft; 27 m).
The phrase was popularized after Life magazine published the painting Marines Call It That 2,000 Yard Stare by World War II artist and correspondent Tom Lea, [4] although the painting was not referred to with that title in the 1945 magazine article.
The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10 −6 metres ( 1 / 1 000 000 m = 0. 000 001 m). To help compare different orders of magnitude , this section lists some items with lengths between 10 −6 and 10 −5 m (between 1 and 10 micrometers , or μm).
The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
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).
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Therefore, a pressure altitude of 32,000 ft (9,800 m) is referred to as "flight level 320". In metre altitudes the format is Flight Level xx000 metres. Flight levels are usually designated in writing as FLxxx, where xxx is a two- or three-digit number indicating the pressure altitude in units of 100 feet (30 m). In radio communications, FL290 ...
[1] [2] It has been generally accepted by naval architects and industry executives that superyachts range from 37 m (≈120 ft) to 60 m (≈200 ft), while those over 60 m are known as megayachts and boats over 90 m (≈300 ft) have been referred to as giga-yachts. [3] [4]