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Additional considerations, POH / instruments in MPH vs Knots?

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Aircraft Systems, General Aviation, Instrument Rating, Private Pilot, Student Pilot

What are some additional considerations / concenrs when flying an aircraft where all speeds are MPH vs Knots, range in miles not nautical miles, etc? Would that affect (increase load) while instrument training or flying in general? 

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1 Answers



  1. Chris Carlson on Feb 21, 2013

    I would say yes. It would be a simple conversion that can be done on an e6b in less than 2 seconds, but something that will be annoying over time. Cross country planning will have to be converted for wind information and charted info is all based on the nautical mile. Instrument approaches are measured in nm and have speed information in knots. For general vfr flight where there isn’t much in the way of planning, it would not be a problem. But I would not say that it will increase workload. The cockpit, because most of the number crunching would be something done before a flight (cross country calculations, approach speed for localized timing). If it is a matter of 5 dollars difference in an aircraft rental, spend the extra cash, but if its a 500 dollar or more avionics upgrade, it’s not too difficult to crunch some easy math. 1 nautical mile is equal to 1.15 statue miles.

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