Magnetic Variation Sectional Chart
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Magnetic Variation Sectional Chart
In this example, we subtract: A magnetic compass is sometime used On the sectional look for the dashed magenta lines with a number nearby.
Var refers to what's inside the paranthesis ( z times y) where z is the value that adds annualy to d, and. Magnetic and true north poles. Lines of variation are shown on a sectional chart as dashed magenta lines and called isogonic lines.
Symbols shown are for world aeronautical charts (wacs), sectional aeronautical charts (sectionals), terminal area charts (tacs), vfr flyway planning charts and helicopter route charts.
In his book, the american practical navigator, nathanial bowditch defined variation as “the angle between the magnetic and geographic meridians at any place, expressed in degrees and minutes east or west to indicate the direction. Bearings and radials in aeronautical charts are magnetic. Local magnetic notes unreliability notes compass rosette shown only in areas void of vor. By adding or subtracting variation from your true heading you will get your magnetic heading.
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