A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 m), used especially for measuring the depth of water.
Fathoms are a British unit of depth measurement equivalent to 6 feet or 1.83 meters, making the Fifty Fathoms rated to 300ft, or 91.5m.
Typically, a knot would be made at each fathom length of rope, allowing sailors to count off the fathoms as they dropped the rope to the bottom. Ocean depth is measured in fathoms, one of which is equal to six feet.
fathom, old English measure of length, now standardized at 6 feet (1.83 metre), which has long been used as a nautical unit of depth.
In fact, the “deep sea” begins at 1000 fathoms deep (about 1900 meters or 1.2 miles!). Though the depth of the ocean varies by location, it has an average depth of 3.7 km (2.3 miles) deep. At this depth, little to no light penetrates.
There are two yards (6 feet) in an imperial fathom. Originally the span of a man's outstretched arms, the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an (Admiralty) nautical mile or as a multiple of the imperial yard.
The Pacific is also our planet's deepest water body, with an average depth of approximately 4,000 meters (13,000 feet).
The word 'furlong' comes from 'a furrow long', or the distance that could be ploughed by an ox without a rest. A foot was traditionally the length of a man's foot, and 'inch' comes from the Latin word 'uncia', meaning 'one-twelfth'.
Officially anything deeper than just 200 metres is considered the “deep sea”, but the average depth of the entire ocean is about 3.5km and the deepest point – the Challenger Deep in the Mariana Trench, in the western Pacific – is a little short of 11km down.
Challenger Deep, in the Mariana Trench, is the deepest point in the ocean known so far, at approximately 11 kilometres - deeper than Mount Everest is tall. The Mariana Trench is 2,500 kilometres long, running north to south in a crescent-shape.
The term knot derives from its former use as a length measure on ships' log lines, which were used to measure the speed of a ship through the water. Such a line was marked off at intervals by knots tied in the rope. Each interval, or knot, was about 47 feet (14.3 metres) long.
Knots, on the other hand, are used to measure speed. One knot equals one nautical mile per hour, or roughly 1.15 statute mph. The term knot dates from the 17th century, when sailors measured the speed of their ship using a device called a “common log.”
A furlong is a unit of measurement that's equal to 220 yards. It takes eight furlongs to make a mile. These days, the measurement is mainly used to mark distances in horse racing. Furlongs were once a common way to measure farmland, with one furlong being the length of a furrow in a 10-acre field.
Off the Gold Coast, where I live, we have two extensive reef complexes on the 36 and 50 fathom line. These rock ridges extend from the Tweed to Point Lookout and are situated roughly 20 and 33 kilometres offshore, depending on which end of the coast you are on.
91 meters equal 298.556430446 feet (91m = 298.556430446ft). Converting 91 m to ft is easy. Simply use our calculator above, or apply the formula to change the weight 91 m to ft.
Cask & Currents
We escort the rum in American white oak bourbon casks to a secret location off the Cayman coast. Anchored at 42 feet, an exact seven fathoms deep, our hand-crafted rum enjoys underwater currents that rock the spirit gently and consistent temperatures like nowhere on land.
In the Pacific Ocean, somewhere between Guam and the Philippines, lies the Marianas Trench, also known as the Mariana Trench. At 35,814 feet below sea level, its bottom is called the Challenger Deep — the deepest point known on Earth.
With specialized equipment such as scuba gear and oxygen tanks, a human can dive to depths of over 1000 feet (305 meters). However, diving to such depths requires extensive training and experience, and the risks of decompression sickness and other diving-related injuries increase significantly.
The deepest depth a submarine has gone is 10,925 meters (35,843 feet) by the Deepsea Challenger in 2012. This was a manned submersible, not a military submarine. The pressure at this depth is over 1,000 times that at the surface, which is why only a few submersibles have been able to go this deep.
The 'Chain' comes from the 'Surveyors' Chain', invented by Edmund Gunter, a mathematician who lived from 1581-1626, hence it is also known as 'Gunter's Chain'. As we all know, a chain is 22 yards, or the length of a cricket pitch.
he "chain" is a unit of measurement that was invented in the early 1600's by an English mathematician named Edmund Gunter. One chain equals 66 feet. This number may seem odd, but Gunter chose it because it was equal to one-tenth of a furlong, which was a common measurement used by English farmers and landowners.
Furlongs were used to describe the distance of Australian horse tracks up until the early 1970's when we adopted the metric system, however, you will still hear racing aficionados use the term today. Also still used in the USA. A furlong is equal to 1/8 of a mile, 220 yards, 660 feet or approximately 200 metres.
Sunlight does not penetrate the eternal darkness below 1,000 meters (3,280 feet), an area known as the aphotic zone, which includes the midnight zone (or bathypelagic zone) between 1,000 and 4,000 meters (3,280 and 13,123 feet), the abyss (or abyssopelagic zone) between 4,000 and 6,000 meters (13,123 and 19,685 feet), ...
The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.
Amazingly, dumbo octopuses are the deepest living genus of all known octopuses – living at depths around 13,000 feet ( 4,000 meters). Because there are so few predators for the dumbo octopus at these extreme depths, they do not have an ink sac like most octopus species do.