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Old 19th Jul 2012, 04:43
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Question NAV Question

If can have help with the below please , and how do you come to the answer? eg is there a rule for a particular question like this, do you find the Great Circle track on a particular side? or? ..thanks!

You are operating on a Great Circle track between S 46 ° W 120 ° and S 46° W 160 ° . When crossing the W 140° longitude, the latitude indicated on your IRS would be?

A) on S 46°00'
B) IRS will not give you latitude readout
C) South of S 46°00' latitude
D) North of S 46° 00' latitude
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Old 19th Jul 2012, 13:14
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C.

I'm sure there's a rule, but I just mentally pictured a globe and drew a great circle on it.
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Old 19th Jul 2012, 14:31
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Great circle always curves away from the equator -curves to the south in the southern hemisphere and to the north in the northern hemisphere.
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Old 19th Jul 2012, 14:55
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I think what they are testing that that circles described as constant latitude are not great circles unless they are on the equator.

Ans : C

Click on the link to see the answer

Great Circle Mapper
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Old 19th Jul 2012, 21:33
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Many thanks - that's awesome
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Old 20th Jul 2012, 04:26
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Answer C - In the Southern Hemisphere, the great circle track will 'bow' towards the South pole.
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