Transmission of time

When transmitting time:

  • only the minutes of the hours should be normally required
  • each digit should be pronounced separately
  • the hour should be included when confusion may result (e.g. when crossing the hour)
  • the 24 hour clock should always be used
  • all time reference should be made in Co-ordinated Universal Time (UTC), sometimes referred to as Zulu (Z), previously called Greenwich Mean Time (GMT)
  • Correct time, Expected Approach Time (EAT), Revised EAT and SLOT  time must be given in hours and minutes
  • EAT and SLOT Time must be read back
  • Estimated times of arrival may be also be given in local time