Exam 3 Flashcards
What are the (4) categories of nautical lights?
- major lights
- minor lights
- primary lights
- secondary lights
What are the “general” dimensions of a ‘large navigational buoy’?
40’ diameter
36’ light height above water
What are station buoys?
- small unlighted buoys positioned near large navigational buoys and oil rig anchor chains.
- they indicate whether or not the Nav buoy has dragged anchor or mark the position of the oil rig anchor chain
What does I.A.L.A. stand for?
International Association of Lighthouse Authorities
What is the Light List abbreviation “F” stand for?
Fixed
What is the Light List abbreviation “Oc” stand for?
Occulted
What is the Light List abbreviation “Iso” stand for?
Isophase
What is the Light List abbreviation “Fl” stand for?
Flashing
What is the Light List abbreviation “Q” stand for?
Quick flashing
What is the Light List abbreviation “Al” stand for?
Alternating light
What is an “Alternating Light” and where is it found?
An airport light beacon.
For lights with different sectors and colours, what color is expected to indicate dangers to navigation?
Red
What is the “loom” of a light?
It is the glow it produces in the sky that can be seen at night even when the light itself is not visible
What does “dipping” a light mean?
A method of determining distance from a light by attempting to see if the light can be seen from a higher deck but not the lower deck. If so this indicates that light as at the geographical range of the light.
Where are range lights placed?
Range lights are placed on land and when lined up indicate the center of the channel
If returning from sea, what is the color and number of the buoys you’d put on your PORT side?
Green - Odd
What term is used to describe the difference in height between two high tides or between two low tides on a tidal day?
Diurnal inequality
What is the term used for the higher of the two high tides on a given tidal day?
Higher high water
The higher of the two low tides on a given tidal day is termed:
Higher low water
_______ ______ ______ is the lower of the two high tides on a given tidal day.
Lower high water
What is the term used to describe the lower of the two low tides on a given tidal day?
Lower low water
What s the arithmetic mean of the heights of the higher high waters at a location over a period of 19 years?
Mean higher high water
What is the “range” of a tide?
The difference between mean high water and mean low water.
______ of the tide is a period of time at high water or low water when there is no perceptible change in the height of the tide.
Stand of the tide
