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The heart of the sanctuary is Stellwagen Bank, an underwater plateau stretching 19 miles (17 nmi; 31 km) north to south, and 6 miles (5.2 nmi; 9.7 km) across at its widest near its southern end. The bank is, on average, 100 to 120 feet (30 to 37 m) below the surface, while surrounding waters to the west are over 300 feet (91 m) deep and to the ...
NOAA 3-D computer image depicting the Monterey Canyon system. Monterey Canyon, or Monterey Submarine Canyon, is a submarine canyon in Monterey Bay, California with steep canyon walls measuring a full 1 mile (1.6 km) in height from bottom to top, which height/depth rivals the depth of the Grand Canyon itself.
The Northeast Canyons and Seamounts Marine National Monument is located within the New England and mid-Atlantic regions, 130 miles southeast of Cape Cod. [1] It comprises a total area of 4,913 square miles, [1] and protects four underwater seamounts (Bear, Mytilus, Physalia, and Retriever Seamounts) and three submarine canyons in the edge of the continental shelf (Oceanographer, Lydonia, and ...
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
An octocoral (class Octocorallia) in the Hudson Canyon. The Hudson Canyon is a submarine canyon that begins from the shallow outlet of the estuary at the mouth of the Hudson River. It extends out over 640 km (400 mi) seaward across the continental shelf finally connecting to the deep ocean basin at a depth of 3–4 km (1.9–2.5 mi) below sea ...
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Submarine navigation underwater requires special skills and technologies not needed by surface ships. The challenges of underwater navigation have become more important as submarines spend more time underwater, travelling greater distances and at higher speed. Military submarines travel underwater in an environment of total darkness with ...
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