Use Chart E(LO) 1 and NOT the photocopy.

If you align your protractor with CRK Magnetic North you will note that Airway W10 which is shown as being aligned with 053° on the chart is actually aligned with 053° on the protractor, however, Airway B10 which is shown as being aligned with 094° on the chart is actually aligned with 092° on the protractor.

Similarly, if you align your protractor with SHA Magnetic North you will note that Airway G1 which is shown as being aligned with 115° on the chart is actually aligned with 118° on the protractor and Airway G4 which is shown as being aligned with 173° on the chart is actually aligned with 176° on the protractor.

It is for this reason that we advise you to align your protractor with the Airway nearest the magnetic track that you are plotting and not Magnetic North. This will achieve the smallest margin of error.