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How should 118.1 be transmitted to indicate a frequency?
  • A
    One one eight one.
  • B
    One one eight decimal one.
  • C
    One one eight point one.
  • D
    One eighteen one.

ICAO Annex 10, Volume II
5.2.1.4.1.3 Numbers containing a decimal point shall be transmitted as prescribed in 5.2.1.4.1.1 with the decimal point in appropriate sequence being indicated by the word DECIMAL.

Note 1.— The following examples illustrate the application of this procedure:

100.3 = ONE ZERO ZERO DECIMAL THREE
38 143.9 = THREE EIGHT ONE FOUR THREE DECIMAL NINE

Note 2.— For identification of VHF frequencies the number of digits used after the decimal point are determined on the basis of the channel spacing (5.2.1.7.3.4.3 refers to frequencies separated by 25 kHz, 5.2.1.7.3.4.4 refers to frequencies separated by 8.33 kHz).

Note 3.— The channelling/frequency pairing relationship for 8.33 kHz and 25 kHz is found in Table 4-1 (bis), Volume V

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