CPL Navigation · Mock exam

A pilot using a paper chart notes that the chart was printed in 2019 and shows isogonals from that year. By 2026, magnetic variation values may have changed due to secular variation. For aviation planning purposes the pilot should:

• A.Add 1° per year to correct for secular variation, as this is the standard rate worldwide
• B.Apply the correction only for flights over the ocean where variation changes fastest
• C.Consult a current source such as the IGRF model, a current chart or AIP ENR for the route's current variation
• D.Use the 2019 variation without adjustment — secular variation is too small to matter for flight