General Navigation Flashcards

1
Q

Rhumb line

A

Line of constant track

Always on Equator side from great circle track

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2
Q

Earth radius

A
Equatorial radius (semi-major): 6378 km (3440 nm)
Polar radius (semi-minor): 6356 km (3429 nm)
Diff: 21.39 km
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3
Q

Ratio of Ellipticity

A

Ratio of Ellipticity = (a - b) / a = 1/298 = 0.0033

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4
Q

Distance along meridian

A

From equator to pole:
10000 km
90* = 5400’
5400 nm

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5
Q

Distance along parallel

A

Departure (nm) = Change of Longitude in minutes x cos( Latitude )

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6
Q

Convergency

A

Convergency is change of track along great circle due to converging meridians

Conv = Change of Longitude x sin( mean Latitude )

Zero on equator, max on poles, works for change of Longitude < 30*

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7
Q

Conversion angle

A

Angle between great circle and rhumb line

Conversion Angle = 1/2 Convergency

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