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chibbard
Magnetic variance - East is least?
I am planning a flight that flies in an easterly direction. For example, one of my legs is from KTTA to KHRJ. The true course is 124 however the magnetic course is 132. I would expect an easterly heading to subtract the magnetic variance. Why is it being added?
Eventer
Magnetic variance
Yes, east is least. But that has nothing to do with the direction you fly. Look at your chart and you will see purple dashed lines that run from the bottom of the chart to the top. These are isogonic lines which will have the variance Marked. For your flight the closest isogonic line is labeled 8W, therefore you need to add 8 to your heading. I hope this explains it.
eshreffler
eshreffler's picture
Reply
My first thought was funny question for a 22 nm 'trip'. Anyway I see this for your trip, and it does not make sense. Initial true bearing: 124° Initial magnetic bearing: 133° 9 ° difference. Just looking at a chart in your area, (I am in California), it looks more like a 5° difference, so I am confused, but for a different reason. But east is least and magnetic north is left of true north for you. So you have to travel more° around the circle to find your intended heading. Just look at a VOR in your area on a Sectional to see it visually. ed
dpk1nba
dpk1nba's picture
Magnetiuc variation closest
http://skyvector.com/content/magnetic-course-numbers-few-degrees#comment-1427

Dan