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On the Sectional and the WAC the Isogonic line near Petaluma (O69) shows 14*30" E. The airport info in the Garmin Pilot app, the Wing X Pro app, and the Variation at AirNav.com shows 16*E. AirNav shows it as 16*E(1985). So why the variation? (pun intended) Enquiring mind need to know! Rolf N9EY