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Ground speed using E6B

Old 02-10-2009, 08:24 AM
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Originally Posted by Cubdriver View Post
On a standard sectional one thumb knuckle length is about 10 miles. You can compare your own thumb knuckle to ten nautical miles against the radius of any VOR rose on a standard sectional, because they all have a 10 nm radius. So, using your thumb knuckle to measure the distance between a couple of points you pass on the map and on the ground, note the time it takes to cross those points, then put the ratio into the rotary side of the E6B. Where the 60 is on the bottom dial is your ground speed in knots.
The thumb knuckle method reminds me of the 100nm hi-chart standard gov't issued pen used for x/c flight planning - ala - can I make it from here to here in a tank of gas

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