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Question ID N99116

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  • Question ID N99116

    Hi,
    Not sure if I have missed something completely or an error.

    This question refers to finding the departure point of the N48 003E / N48 002W
    I used the departure formula to calculate.

    5 degree change x 60 = 300NM
    Then 300 NM x cos .48

    My answer of 300 was incorrect however in the answer workings the method uses 300 NM x .67 = 200

    My question is where does the x.67 come from as I thought you use the Cosine of the latitude as part of the formula.

    Any feedback welcome.

    Thanks

  • #2
    The change in longitude is 5 degrees. That is 5 x 60 =300 minutes of longitude change.
    The departure (the rhumb line distance between the two points along the 48N parallel of Latitude) is calculated using the departure formula which is the change of longitude in minutes times the cosine of the latitude.
    The cosine of 48 is 0.669 which we've rounded to .67. This is where the .67 comes from.
    300 x .67 is 200 , so the Departure is 200 NM
    Hope this helps

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    • #3
      Hi,
      Thanks for the feedback, that helps, I thought I have missed something!

      Comment

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