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The scale factor at the central meridian of a UTM zone is

  • A.1.0004
  • B.0.9996
  • C.1.0000
  • D.0.9990

Answer: B

Reducing the scale very slightly at the centre makes the zone secant rather than tangent, so scale is true along two lines within the zone. That spreads the error across the zone instead of letting it grow steadily from the middle.

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