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Half astern; Full astern; Emergency astern (1940–present) Any orders could also be accompanied by an RPM order, giving the precise engine speed desired. Many modern ships have the following dial indications: Full ahead navigation (on notice to increase or reduce) Full ahead; Half ahead; Slow ahead; Dead slow ahead; Stop; Dead slow astern ...
Astern (adjective): toward the rear of a ship (opposite of "forward"). [9] Athwartships: toward the sides of a ship. [1] Aweather: toward the weather or windward side of a ship. [10] Aweigh: just clear of the sea floor, as with an anchor. [11] Below: a lower deck of the ship. [1] Belowdecks: inside or into a ship, or down to a lower deck. [12]
Slow ahead/astern, the number of revolutions is standardized for the individual ship and is unstated; Half ahead/astern, accompanied by an order for a power setting (e.g., "half ahead both engines, revolutions 1,500") Full speed ahead/astern. This is reserved for emergencies and as such the word "speed" is included to distinguish it from the ...
Selective backing and filling of these sails moves the ship ahead or astern, so allowing it to be kept in the best part of the channel. A jib and the spanker are used to help balance the sail plan. This method cannot be used if the wind is going in the same direction and at the same speed as the tide.
The pilot of a boat observes that the relative bearing of another boat is less than 180° and decreasing (that is, it is now closer to dead ahead than before). He now knows he will pass astern of the other boat. If the bearing were to remain constant, the two boats would be on a collision course.
But with the Kort Nozzle, the ahead and astern thrust is the same. Other advantages of the nozzle are the ship can be steered astern which a conventional rudder cannot, and the ship can be steered fully under control to a standstill switching between ahead and astern mode to give complete control over speed.
Astern propulsion (as applied to a ship) is a maneuver in which a ship's propelling mechanism is used to develop thrust in a retrograde direction. Astern propulsion does not necessarily imply the ship is moving astern ( in reverse ); astern propulsion is used to slow a ship by applying a force in the direction of the bow of the ship, instead of ...
Following seas, combined with high winds (especially from the stern, or from behind the boat), can be dangerous and cause a boat to yaw (turn sideways) and swamp or plow under the wave ahead, if the winds and sea are too strong or violent. The original term may have been "Fair winds and a fallowing sea" where fallow means inactive.