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  2. Submarine depth ratings - Wikipedia

    en.wikipedia.org/wiki/Submarine_depth_ratings

    This is the maximum depth at which a submarine is permitted to operate under normal peacetime circumstances, and is tested during sea trials.The test depth is set at two-thirds (0.66) of the design depth for United States Navy submarines, while the Royal Navy sets test depth at 4/7 (0.57) the design depth, and the German Navy sets it at exactly one-half (0.50) of design depth.

  3. Under keel clearance - Wikipedia

    en.wikipedia.org/wiki/Under_keel_clearance

    UKC = Charted Depth − Draft-/+ Height of Tide. Ship masters and deck officers can obtain the depth of water from Electronic navigational charts. [5] More dynamic or advanced calculations include safety margins for manoeuvring effects and squat. [7] Computer systems and software can be used to manage and calculate UKC for ships and ports.

  4. Keel depth - Wikipedia

    en.wikipedia.org/wiki/Keel_depth

    Keel depth (sometimes given as Depth to keel) is the depth (or draft) of water from the water surface to the keel of a vessel, the deepest part. The keel establishes a commonly defined reference point to measure to. Keel depth is useful for determining safe operating depth in shallow water.

  5. Nautical chart - Wikipedia

    en.wikipedia.org/wiki/Nautical_chart

    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 ...

  6. Bowditch's American Practical Navigator - Wikipedia

    en.wikipedia.org/wiki/Bowditch's_American...

    Since the government began production, the book has been known by its year of publishing, instead of by the edition number. After the first major revision, a total overhaul of the book's content completed in 1880 under the direction of Commander Philip H. Cooper, USN, the name was changed to American Practical Navigator.

  7. List of submarine topographical features - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine...

    An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]

  8. Magnum P.I. Cancelled at NBC, Will End With Upcoming Season 5B

    www.aol.com/magnum-p-cancelled-nbc-end-001900033...

    NBC is saying aloha to Magnum P.I. — and in this case, “aloha” means goodbye. Magnum will end with the upcoming Season 5B, TVLine has confirmed. (Our sister site Deadline first reported the ...

  9. List of submarine classes of the United States Navy - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine_classes...

    Submarines of the United States Navy are built in classes, using a single design for a number of boats. Minor variations occur as improvements are incorporated into the design, so later boats of a class may be more capable than earlier.