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Altimeter settings provided to aircraft shall be…

  • A
    rounded up to the nearest higher half of hectopascal.
  • B
    rounded down to the nearest lower half of hectopascal.
  • C
    rounded down to the nearest lower whole hectopascal.
  • D
    rounded up to the nearest higher whole hectopascal.

ICAO Doc 4444
4.10.4 Provision of altimeter setting information

4.10.4.7 Altimeter settings provided to aircraft shall be rounded down to the nearest lower whole hectopascal.

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