(Back of Kane Dead Reckoning Computer) I found this in my dad's things after he passed. This was a very clever device that helped in the calculation of: Time, ground/air speed and distance problems Fuel consumption Altimeter and airspeed corrections (for atmospheric pressure and temperature variations) Airspeed corrections Density altitude Drift correction (if you find yourself off course) Conversions (the flying world uses a confusing plethora of units - nautical miles, knots, km, U.S gallons, Imperial gallons, litres, feet, pounds, kg) Wind and plane velocity vector problems (hence the name "dead reckoning")
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