106. Navigation Fundamentals Flashcards
Explain the duties of the Officer of the Deck
Designated by the CO to be responsible for the safe and proper operation of the ship.
Explain the duties of the Conning Officer
Orders courses and engine orders to the Helmsman/Lee Helmsman.
Explain the duties of the Boatswain’s Mate of the Watch
Ensures all deck watch stations are manned
Explain the duties of the Helmsman/Lee Helmsman
Responsible for keeping the ship on course as directed by the Conning Officer.
Lee Helmsman is responsible for operating the engine order telegraph and relaying information from bridge to main control.
Explain the duties of the Lookouts
Responsible for reporting any contacts or objects in the water to the OOD
Explain the duties of the Quartermaster of the Watch
Assists the OOD in the safe navigation of the ship using all means of navigation, CelNav, Plotting, RadioNav
Define Latitude
Measured in degrees, minutes, and seconds NORTH or SOUTH of the equator. Cannot exceed 90 degrees in either direction.
Define Longitude
Measured the same way as latitude but EAST or WEST, or the Prime Meridian. Measured from 0 degrees to 180.
Define Set/Drift
Set: The direction of external forces tend to push a vessel (wind or current)
Drift: The velocity of the force measured in knots.
Define GMT/Coordinated Universal Standard Time
Time at 0 degrees longitude (Greenwich, England). Used as a reference in almanacs.
Define time zones
Each time zone is 15 degrees of longitude, there are 24 time zones and 25 designations.
Define variation/deviation
Variation: earth’s magnetic properties that deflect the compass.
Deviation: Amount the ship’s compass is deflected due to the effects of the ship’s iron.
Define IALA (A/B) Buoyage system
International Association of Lighthouse Authorities
A: Europe, Africa, Australia, New Zealand, Most of Asia
B: The Americas, Japan, South Korea, and the Philippines
Define Cardinal system
Generally marks the geographical relationship to the aid of a hazard in terms of N/S/E/W
Discuss the different methods of attaining a ship’s position
Piloting: determine position by using landmarks. A fix is obtained by using two or more landmarks.
Dead Reckoning: projecting an intended course and speed from an unknown point.
Celestial: observing the sun, moon and stars to determine position.
Electronic Nav: using radar, GPS, etc
Define the purpose of range and channel markings
Range: buoys that mark distance to a certain point.
Channel: buoys used to mark safe water areas and traffic schemes
Define advance/transfer
Advance: the amount of distance on the original course until the ship is on the new course.
Transfer: amount of distance gained to the new course.
Define pivot point
A point on the ship’s centerline about which the ship turns when the rudder is put over
Define turning circle
The path of the ship’s pivot point when making a 360 degree turn.
Define true bearing
True direction (000-359 degrees)
Define relative bearing
Direction in relation to the ship with the bow representing 000 degrees.
Define DIW
Dead in Water, vessel not moving through water
Define head on
A vessel whose bow is pointed at your own ship’s bow.
Define crossing
A situation in which two vessels are sailing perpendicular to one another.
