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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Aeroplanes and Dirigibles of War by Frederick A. Talbot: airman is equipped with a compass he must be able to find his
way, but this is a fallacy. The aviator is in the same plight as
a mariner who is compelled from circumstances to rely upon his
compass alone, and who is debarred by inclement weather from
deciding his precise position by taking the sun. A ship
ploughing the waters has to contend against the action of cross
currents, the speed of which varies considerably, as well as
adverse winds. Unless absolute correction for these influences
can be made the ship will wander considerably from its course.
The airman is placed in a worse position. He has no means of
determining the direction and velocity of the currents prevailing
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