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T-Nav > Exam 3 > Flashcards

Exam 3 Flashcards

1
Q

What are the (4) categories of nautical lights?

A
  • major lights
  • minor lights
  • primary lights
  • secondary lights
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2
Q

What are the “general” dimensions of a ‘large navigational buoy’?

A

40’ diameter

36’ light height above water

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3
Q

What are station buoys?

A
  • 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
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4
Q

What does I.A.L.A. stand for?

A

International Association of Lighthouse Authorities

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5
Q

What is the Light List abbreviation “F” stand for?

A

Fixed

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6
Q

What is the Light List abbreviation “Oc” stand for?

A

Occulted

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7
Q

What is the Light List abbreviation “Iso” stand for?

A

Isophase

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8
Q

What is the Light List abbreviation “Fl” stand for?

A

Flashing

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9
Q

What is the Light List abbreviation “Q” stand for?

A

Quick flashing

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10
Q

What is the Light List abbreviation “Al” stand for?

A

Alternating light

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11
Q

What is an “Alternating Light” and where is it found?

A

An airport light beacon.

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12
Q

For lights with different sectors and colours, what color is expected to indicate dangers to navigation?

A

Red

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13
Q

What is the “loom” of a light?

A

It is the glow it produces in the sky that can be seen at night even when the light itself is not visible

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14
Q

What does “dipping” a light mean?

A

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.

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15
Q

Where are range lights placed?

A

Range lights are placed on land and when lined up indicate the center of the channel

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16
Q

If returning from sea, what is the color and number of the buoys you’d put on your PORT side?

A

Green - Odd

17
Q

What term is used to describe the difference in height between two high tides or between two low tides on a tidal day?

A

Diurnal inequality

18
Q

What is the term used for the higher of the two high tides on a given tidal day?

A

Higher high water

19
Q

The higher of the two low tides on a given tidal day is termed:

A

Higher low water

20
Q

_______ ______ ______ is the lower of the two high tides on a given tidal day.

A

Lower high water

21
Q

What is the term used to describe the lower of the two low tides on a given tidal day?

A

Lower low water

22
Q

What s the arithmetic mean of the heights of the higher high waters at a location over a period of 19 years?

A

Mean higher high water

23
Q

What is the “range” of a tide?

A

The difference between mean high water and mean low water.

24
Q

______ 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.

A

Stand of the tide

T-Nav (3 decks)

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