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The term "maximum elevation figure" (MEF) is defined as...

• A

the highest elevation within an area covering 30 minutes of latitude and 30 minutes of longitude.

• B

the highest elevation within an area covering 30 minutes of latitude and 30 minutes of longitude plus a safety margin, rounded to the next higher 100 ft.

• C

the highest elevation within an area covering 30 minutes of latitude and 30 minutes of longitude plus a safety margin of 1000 ft (305 m), rounded to the next higher 100 ft.

• D

the highest elevation within an area covering 1 degree of latitude and 1 degree of longitude plus a safety margin, rounded to the next lower 100 ft.

Refer to figure.
One of the most important numbers on a sectional is the Maximum Elevation Figure, or MEF. The Maximum Elevation Figure (MEF) represents the highest elevation within a quadrant, including terrain and other vertical obstacles (towers, trees, etc.). A quadrant on Sectionals is the area bounded by ticked lines dividing each 30 minutes of latitude and each 30 minutes of longitude. So, the MEF depicts the lowest altitude you can fly and still be assured to clear every obstacle within that quadrant.

MEF’s are calculated in two ways, one for natural obstacles, and one for man-made obstacles. Each method ensures the highest level of safety and that as long as you stay above MEF you will be clear of all obstacles. MEF figures are rounded up to the nearest 100 ft value and the last two digits of the number are not shown.

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