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Question ID: 330024

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  • Question ID: 330024

    My question is that I don't understand both the explanation and the correct answer.
    As per my understanding, to calculate the distance, I must use the formula : Ch.long x cos(mean lat)
    So the correct calculation should be 26 x 60 x cos (63 ) = 708 NM

    It is the same explanation for Question ID 330029
    Am I missing something ?
    Thank you very much for your help.
    Fouga
    Last edited by Fouga_GVA; 04-02-2017, 12:41.

  • #2
    Hi
    You cannot use the departure formula if the latitudes are different. Using the mean latitude is only appropriate in the convergency formula.
    These two questions are plotting questions and do not require you to use a formula- just plot the points, measure the length of the line between them and then use the latitude marks on the chart to measure the line length in degrees and minutes. 1 degree of latitude is 60NM, 1 minute of latitude is 1NM.
    Hope this helps.

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    • #3
      Hello Jones.
      Thank you for your prompt answer. Yes I understand now.
      Fouga

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