NavCanada is outlining changes to the way they publish and calculate the magnetic variation in AIC 12/08.

In a nutshell: they are going to calculate the variation every year, on July 1st. Something I’ve been doing at World Flight Planner for the past 3 years. NavCanada will be using the same IGRF model that the flight planning website uses. So this is welcome news and further validates how I do things at WFP

Variation will not be calculated for northern domestic airspace and in the southern domestic airspace the variation …