The Mariana Trench  Converting to Nautical Measurements
The Mariana Trench is
6033.5 fathoms deep. Knowing that it is (11,033 meters (36,201
feet) deep,
how do do we perform the conversion to fathoms? Convert feet to
fathoms and other nautical measurement units with this table from the
US Naval Oceanographer.Conversion Table
1 fathom = 6 feet
100 fathoms = 1 cable length
10 cables length = 1 nautical mile
1 nautical mile = 1.151 statute miles (length of a minute of longitude
at equator)
3 nautical miles = 1 league
1 knot = 1 nautical mile per hour = 1.151 statute miles per hour
10 chains = 1 furlong = 201.17 meters
60 nautical miles = 1 degree of a great circle of earth (latitude)
1 statute mile = 5280 feet
1 nautical mile = 6076.115 feet
Note: Statute miles is what we know as miles and is a
measurement of distance over land. Nautical miles is a measurement
over water.
Origin of Nautical Terms
Fathom  Sailors use to throw a line into the water, wait
until it hit the bottom, pull it back up, while measuring the length
of the line from finger tip to finger tip. The arm span of an average
sailor was 6 feet and called a fathom.
Knot  Lines used to be thrown over the sides of ships to
determine speed. Each line was divided into 47 ft. 3 in. sections and
were called knots. The line was allowed to run over the ship's side
while a 28second glass was emptying itself. The length of the knot
was derived from the proportion that one hour (3600 sec) is to 28
seconds as one mile (6076.115 ft.) is to the length of one knot (47
ft. 3 in.)
The information on this page is based on public domain text from US
Naval Oceanographer:
http://oceanographer.navy.mil/pacific.html
