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A sailor and a man on shore, both sounding the depth with a line. Depth sounding, often simply called sounding, is measuring the depth of a body of water.Data taken from soundings are used in bathymetry to make maps of the floor of a body of water, such as the seabed topography.
Depths which have been measured are indicated by the numbers shown on the chart. Depths on charts published in most parts of the world use metres. Older charts, as well as those published by the United States government, may use feet or fathoms. Depth contour lines show the shape of underwater relief. Coloured areas of the sea emphasise shallow ...
fathom: fathom (none) fathom ≡ 6 ft 1.0 fathom (6.0 ft; 1.8 m) yard: yd yd assumes the international definition 1.0 yd (0.91 m) foot: ft (foot) ft long code "foot" outputs foot (and never feet) Use of ′ and ″ symbols violates MOSNUM so is not provided. 1.0 ft (0.30 m) ftin (feet and inches) ft m (foot m) inch: in in
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. [1] The fathom is neither an international standard (SI) unit, nor an internationally accepted non-SI unit. Historically it was the maritime measure of depth in the English-speaking world but ...
A cable's length (often "cable length" or just "cable") is simply the standard length in which cables came, which by 1555 had settled to around 100 fathoms (600 ft; 180 m) or 1 ⁄ 10 nautical mile (0.19 km; 0.12 mi). [1] Traditionally rope is made on long ropewalks, the length of which determines the maximum length of rope it is possible to make.
It is the shallowest of the Great Lakes with an average depth of 10 fathoms 3 feet or 63 ft (19 m) [7] and a maximum depth of 35 fathoms (210 ft; 64 m) [7] [8] Because Erie is the shallowest, it is also the warmest of the Great Lakes, [17] and in 1999 this almost became a problem for two nuclear power plants which require cool lake water to ...
Bathymetric surveys and charts are associated with the science of oceanography, particularly marine geology, and underwater engineering or other specialized purposes. Bathymetric map of Medicine Lake, California. Bathymetric data used to produce charts can also be converted to bathymetric profiles which are vertical sections through a feature.
[8]: 10 [9] The most common chart size was early established as the "Double-elephant", about 39 X 25.5 inches, and this has continued to be the case. [10] Chart design gradually simplified over the years, with less detail on land, focusing on features visible to the mariner. Contours were increasingly used for hills instead of hatching.