Flight across Lines of Magnetic Variation
 

Hi All,

I am looking to sit my PPL Nav exam shortly and my studies so far haven't produced an answer to this query.

If I were going to fly from Swansea to Gloucester let's say and the main leg of the journey crossed the 2.5W Isogonal at it's mid-point what would I set the Magnetic Variation as for the leg. I would never be able to fly within .5 of a degree in real life but I understand the Nav exam demands accuracy :)

Thanks for your help!

You take it from the mid way point and it will work out right at the end. This is ok to do in the uk and lower latitudes. Near you get to the magnetic pole the more issues you will have.

That makes sense! Whichever occupies most of the leg I guess. Thanks for your help :ok:

I'm glad you added that. I was beginning to think that this guy's got skills I could never aspire to :)

Just be sure to add it the correct way (or subtract) :ok:

Since 1969 this has stood me in good stead.

Take away any easterly magnetic deviation from the true course heading when setting your compass reading. Add any westerly.

"East is least, West is best"

mike hallam.