Term
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Definition
| the LOS from a position above the earth’s surface to the visual horizon. The line where the earth and sky meet. |
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Definition
| the maximum distance at which a light may be seen under the existing meteorological conditions. Independent of HOE and elevation of light. |
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Definition
| a special case of the luminous range. It is the distance a light could be seen in “clear” weather. Also called the charted range. |
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Term
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Definition
| It is the maximum distance that a light may be seen in perfect visibility, taking elevation into account. |
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Term
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Definition
| Max distance a light can be seen in existing visibility, taking into account the intensity, elevation of the light, the observer’s HOE, and the curve of the earth. It is always the lesser of the luminous range or the geographic range. |
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Term
| How to determine horizontal distance: |
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Definition
| (1.169) (square root of the height of elevation.) |
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Term
| Positive Identification Characteristics of NAVAIDS: Day |
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Definition
Location
Shape
Color Scheme
Auxiliary features
Special Markings |
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Term
| Positive Identification Characteristics of NAVAIDS: Night |
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Definition
Phase characteristic
Period
Color |
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Term
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Definition
| length of time required for light to progress through one complete cycle of changes |
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Term
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Definition
| (red, green, yellow, or white) |
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Term
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Definition
| light sequence or pattern of light shown within one complete cycle of the light. |
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Term
| Types of Phase Characteristics |
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Definition
| fixed, Flashing, Quick Flashing, Group Flashing, Morse Code, Occulting |
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Term
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Definition
red light used in dangerous sectors
sector limits are expressed in degrees true as observed from a vessel, not from the light |
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Term
| US Lateral System (hint: there are two letters which are used, one is international and one is US) |
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Definition
| International Association of Lighthouse Authorities Bravo (IALA B) |
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Term
| Characteristics of IALA B |
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Definition
Red buoysmark the starboard (right) side of channels
When returning from seaward (Red, Right, Returning)
Green buoys mark the port (left) side of channels
When returning from seaward |
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Term
| Three References for bearing |
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Definition
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Term
| Measurements of Distance (4) |
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Definition
| Radar, Eyeballs, Stadimeter, Laser range finder |
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Term
| Making an Observation with the Stadimeter: What must be known in order to find distance? |
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Definition
| To use a stadimeter, we must know the height of the object to be observed. |
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Term
| SPEED THROUGH WATER: How to find? |
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Definition
Impeller Log
Shaft RPM
Pitometer Log (Pitsword)
Converts pressure to speed
Doppler Speed Log (sonar) |
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