Field-book for railroad engineers. Containing formulas for laying out curves, determining frog angles, levelling, calculating earth-work, etc., etc., together with tables of radii, ordinates deflections, long chords, magnetic variation, logarithms ...
World Magnetic Model - Model Limitations
World Magnetic Model - Model Limitations
navigation - Why does this chart seem to show airports with magnetic variation up to 90 degrees? - Aviation Stack Exchange
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Magnetic declination - Wikiwand
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3_2 The Compass
Magnetic declination - Wikipedia
MAGNETIC TO TRUE NORTH
Marine navigation courses: compass
Variation and Deviation Variation and Deviation - Cockpitcards.co.uk
Find Your Declination Adjustment Value
MAGNETIC VARIATION - Definition and synonyms of magnetic variation in the English dictionary
OA Guide to Map & Compass - Part 2
Sailtrain: Navigation and Chartwork, Compass Deviation.
Variation and Deviation Variation and Deviation - Cockpitcards.co.uk
A Table of Magnetic Declinations
Magnetic Declination
OA Guide to Map & Compass - Part 2
Variation and Deviation Variation and Deviation - Cockpitcards.co.uk
