For Bournemouth, all radio frequencies and LOC IBMH are marked with an asterisk - *

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Many other airports also have these markings, such as: Southampton, Alderney, Jersey, Guernsey, Exeter...

However, Cardiff doesn’t have an asterisk preceding to its radio frequencies:

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But it does have one before LOC ICWA

What does an asterisk, preceding a frequency, refer to?


1 Answer 1


It means that this frequency is not always available (not always staffed). From the Introduction to Jeppesen Navigation Charts:


8 - Indicates the service is part time.

And further below:

Navaid boxes include the navaid name, identifier, Morse code, and frequency. A letter "D" indicates DME capability with an asterisk indicating part time.

  • $\begingroup$ So tht would be the same for the LOC IBMH, the would turn off the ILS system? $\endgroup$ Commented Aug 21, 2020 at 13:35
  • $\begingroup$ So yes, according to Jeppesen it means exactly that: it is only available "part time". $\endgroup$
    – Bianfable
    Commented Aug 21, 2020 at 13:42
  • 3
    $\begingroup$ As per UK AIP, EGHH is open 0630-2130. ATS follow AD operating hours, and IMBH is also marked as HO. EGFF on the other hand is open H24, however the ILS is still marked as HO (probably because only one ILS can be on at the time, the other will be off) $\endgroup$ Commented Aug 21, 2020 at 14:10
  • $\begingroup$ aurora.nats.co.uk/htmlAIP/Publications/2020-08-13-AIRAC/html/… $\endgroup$ Commented Aug 21, 2020 at 14:11

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