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35 Cards in this Set
- Front
- Back
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what are the 4 primary areas which navigation is divided?
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Piloting, Dead Reckoning, Celestial Navigation & Radio Navigation
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How it the term Piloting defined?
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The movement of a vessel with continuous reference to landmarks, aids to nav,depth sounding and radio nav.
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how is the term dead reckoning defined?
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projecting the ships intended course and speed from a known point.
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dead reckoning does not consider the effects of wind or current.
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true
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Celestial navigation is defined as the method of obtaining the ship's position by observing the sun, moon, stars and planets
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true
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what accuracy may an experienced QM obtain a celestial fix in relation to the ships position?
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1/10 mi
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celestial nav is accomplished by measuring the hight of a celestial body above which of the following pionts?
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Horizon
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radio nav uses radar pulses to determine a ship's position
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False
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Radio nav is sometimes reffered to as what type of navigation?
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Electronic
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The most basic and important problem facing the navigator is determining which of the following values?
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Position
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The term position refers to a known point on earth.
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True
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On charts direction is measured in polar units using the angular coordinate system.
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True
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The polar coordinate system is based on which of the following positions?
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North and South pole
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How many feet are in a nautical mile?
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6,076.1
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Navigation is based on what type of time?
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24-hour clock
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Which lines are considered to be great circles?
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The Equator & a plane passing through the center of the earth
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what line it not considered a great circle?
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Parallel
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On navigation charts what are parallels called?
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Latitude
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Lines of Latitude are parallel to which of the following reference points?
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Equator
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What is the maximum number of Latitude?
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90
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Latitude is measured north to south of the equator using what?
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Degrees, Minutes, Seconds
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Why is the greenwich meridian called the prime meridian?
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It divides the earth in half
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How is Longitude measured?
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East to West throughout 180 degree's
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A nautical chart is like a road map for the world's oceans and inland waterways.
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True
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what can be found on nautical charts?
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Parallels, Meridians, Aids to navigation
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In what vicinity is the distortion greatest on a Mercator projection chart?
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At the poles
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How do parallels appear on a Mercator projection chart?
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As curved lines that bend toward the top of the chart
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One of the advantages of a Mercator projection Chart is that rhumb lines appear as what type of lines?
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Straight
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What is the advantage of a Gnomonic projection chart?
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Plots great circles as straight lines.
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what best describes a chart scale?
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The larger the scale the smaller the area
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what scale ratio would show the greatest detail?
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1 to 50.000
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Nautical charts are published by DMAHTC and what other agency?
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National ocean service
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On a Small Scale chart, how is each degree usually broken down?
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Into minutes only
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On the earths surface 1 degree of latitude is equivalent to how many nm?
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60.0 nm
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if you are at lat 36.30.0N and long 75.30.0W how many NM are you from the equator?
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2.190
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