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3 Answers

Isogonic lines

Asked by: 2994 views General Aviation, Private Pilot, Student Pilot

When plotting a long cross xountry would you add all Isogonic lines together at beginning and factor them in, or as you cross them

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3 Answers

  1. James on Aug 13, 2012

    I think best practice would be to know your heading in each area, which means as you cross them.

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  2. Steve Butler on Aug 13, 2012

    Depending on what part of the country you are in, the isogonic lines will typically vary from about 40-100 nm. per 30′. Assuming that you are VFR and using a flight log with check points, I would expect that your check points would be no further apart than the distance between the isogonic lines and would use the appropriate line for the segment you are flying at that time.

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  3. Jim Post on Aug 22, 2012

    I recommend you plot your course and headings and apply magnetic varition as it is deplicted on the charts along your course.

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