Final Exam Flashcards
________ is a vertical movement of water.
Tide
__________ is a horizontal movement of water.
Current
What is a current that is frequently caused by a tide called?
Tidal Current
The terms “rise” and “fall” are used to describe what?
A tide
The terms “ebb” and “flood” are used to describe what?
A tidal current
The direction a current flows is called its ________.
Set
The speed of a current is called its what?
Drift
A term used for times when there is little or no current is?
“Slack water”
Having a period or cycle of approximately one tidal day is termed?
Diurnal
_________ means having a cycle of approximately one-half of a tidal day.
Semi-diurnal
The difference in speed between two flood or ebb currents is called?
Diurnal inequality
A current in a channel that is caused by a difference in the surface level at the two ends of the channel:
Hydraulic current
The period of time at high or low water when there is no perceptible change in the height of the tide is termed?
The stand of the tide
A ________ tide is a combination of both a diurnal and semi-diurnal tide.
Mixed tide
What is the term for the compass positioned on the flying bridge of a ship?
A standard compass
What is the compass located in the wheelhouse of a ship called?
A steering compass
The line etched into the forward side of the compass bowl that indicates the heading of the ship is called?
A Lubber’s Line
___________ is the difference between true north and magnetic north.
Variation
___________ is the difference between magnetic north and the direction indicated by the north point of the compass.
Deviation
What are the metal sphere’s located at the sides of the binnacle called and what are they used for?
Quadrantal spheres. They are adjusted to compensate for deviation.
__________ magnetism is present in a material only while the material is under the influence of an external magnetic field.
Induced magnetism
__________ magnetism is the magnetism that remains in the material after the external magnetic field is removed.
Residual magnetism
__________ magnetism is magnetism that is retained for long periods of time without any appreciable reduction.
Permanent magnetism
_________ Sailing assumes the Earth is flat and can be used to solve for course, distance, difference of latitude, and departure but not for longitude.
Plane Sailing
_________ Sailing was used before the invention of chronometers to solve for longitude.
Parallel Sailing
A __________ is drawn through the point “A” when doing a Sailing problem to form part of the triangle.
Meridian
A ___________ is drawn through the point “B” when doing a Sailing problem to form part of the triangle.
Parallel
What are the formula for Parallel Sailing?
Dlo = p (sec L)
p = Dlo (cos L)
Sine =
Hypotenus
Cos =
Hypotenus
Tan =
Adjacent
Secant =
Adjacent
Cosecant =
Opposite
Cotangent =
Opposite
