
A bow thruster or stern thruster is a transversal propulsion device built into, or mounted to, either the bow or stern, of a ship or boat, to make it more manoeuvrable. Bow thrusters make docking easier, since they allow the captain to turn the vessel to port or starboard side, without using the main propulsion mechanism which requires some forwar...
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http://en.wikipedia.org/wiki/Bow_thruster

A small propeller or water-jet at the bow, used for manoeuvring larger vessels at slow speed. May be mounted externally, or in a tunnel running through the bow from side to side.
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http://en.wikipedia.org/wiki/Glossary_of_nautical_terms

A small propeller or water-jet at the bow, used for manoeuvring larger vessels at slow speed. May be mounted externally, or in a tunnel running through the bow from side to side.
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http://en.wikipedia.org/wiki/Glossary_of_nautical_terms

(from the article `ship`) ...but this expedient is often not sufficient for low-speed maneuvering. For this reason, many ships are fitted with a `bow thruster,` a propeller ...
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http://www.britannica.com/eb/a-z/b/101

A small propeller mounted sideways in the bow of a vessel to aid maneuverability.
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http://www.encyclo.co.uk/local/20471

Small propellor mounted sideways in the bow to aid manoeuverability.
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http://www.encyclo.co.uk/visitor-contributions.php

a propeller located in a ship's bow to provide added maneuverability, as when docking.
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https://www.infoplease.com/dictionary/bow-thruster
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