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  2. Stockless anchor - Wikipedia

    en.wikipedia.org/wiki/Stockless_anchor

    The stockless anchor is an improved version of the Admiralty anchor it is derived from. It has two flukes that pivot on the same plane perpendicular to the shank. [2] The weight of the shank and accompanying chain, or the shank angled under tension, keep the anchor laying flat on the sea floor.

  3. Offshore embedded anchors - Wikipedia

    en.wikipedia.org/wiki/Offshore_embedded_anchors

    A deep-penetrating anchor (DPA) is conceptually similar to a torpedo anchor: it features a dart-shaped, thick-walled, steel cylinder with flukes attached to the upper section of the anchor. A full-scale DPA is approximately 15 metres (49 ft) in length, 1.2 metres (4 ft) in diameter, and weighs on the order of 50–100 tonnes (49–98 long tons ...

  4. Pontoon bridge - Wikipedia

    en.wikipedia.org/wiki/Pontoon_bridge

    A pontoon bridge (or ponton bridge), also known as a floating bridge, uses floats or shallow-draft boats to support a continuous deck for pedestrian and vehicle travel. The buoyancy of the supports limits the maximum load that they can carry. Most pontoon bridges are temporary and used in wartime and civil emergencies.

  5. Jackup rig - Wikipedia

    en.wikipedia.org/wiki/Jackup_rig

    The hull is actually a water-tight barge that floats on the water’s surface. When the rig reaches the work site, the crew jacks the legs downward through the water and into the sea floor (or onto the sea floor with mat supported jackups). This anchors the rig and holds the hull well above the waves. [citation needed]

  6. Day shapes - Wikipedia

    en.wikipedia.org/wiki/Day_shapes

    2. Vessel under sail and power Cone, apex down 3. Vessel towing Diamond Tow > 200 m 3. Vessel being towed Diamond Tow > 200 m 4,11. Fishing (with restricted maneuvrability) 2 cones (apexes together) > 20 m (extra cone: gear extending more than 150 metres in that direction) 5. Not under command 2 balls (vert. line) > 12 m 6. Minesweeping 3 balls ...

  7. Buoy - Wikipedia

    en.wikipedia.org/wiki/Buoy

    Target buoys simulate targets, such as small boats, in live-fire exercises by naval and coastal forces. They are usually targeted by medium-sized weapons such as heavy machine guns , rapid fire cannons (~20 mm), autocannons (up to 40–57 mm) and anti-tank rockets .

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