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Old 01-14-2021, 04:35 AM
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Join Date: Sep 2005
Location: Sevierville, Tennessee
Posts: 20,753

Used them many times, well the later versions anyway. The left side helps you plan and determine air speed, ground speed, altitude, fuel burn etc. the right side helped determine true north for course heading variations. No matter where you are on the planet except for the poles there are slight variations that the computer adjusted for.
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