Welcome Guest. Sign in or Signup

3 Answers

Isogonic lines

Asked by: 2569 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

Ace Any FAA Written Test!
Actual FAA Questions / Free Lifetime Updates
The best explanations in the business
Fast, efficient study.
Pass Your Checkride With Confidence!
FAA Practical Test prep that reflects actual checkrides.
Any checkride: Airplane, Helicopter, Glider, etc.
Written and maintained by actual pilot examiners and master CFIs.
The World's Most Trusted eLogbook
Be Organized, Current, Professional, and Safe.
Highly customizable - for student pilots through pros.
Free Transition Service for users of other eLogs.
Our sincere thanks to pilots such as yourself who support AskACFI while helping themselves by using the awesome PC, Mac, iPhone/iPad, and Android aviation apps of our sponsors.

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.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  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.

    0 Votes Thumb up 0 Votes Thumb down 0 Votes



  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.

    +2 Votes Thumb up 2 Votes Thumb down 0 Votes


The following terms have been auto-detected the question above and any answers or discussion provided. Click on a term to see its definition from the Dauntless Aviation JargonBuster Glossary.

Answer Question

Our sincere thanks to all who contribute constructively to this forum in answering flight training questions. If you are a flight instructor or represent a flight school / FBO offering flight instruction, you are welcome to include links to your site and related contact information as it pertains to offering local flight instruction in a specific geographic area. Additionally, direct links to FAA and related official government sources of information are welcome. However we thank you for your understanding that links to other sites or text that may be construed as explicit or implicit advertising of other business, sites, or goods/services are not permitted even if such links nominally are relevant to the question asked.