What does the * (asterisk) next to radio and nav aid frequencies on Jeppesen charts refer to? For Bournemouth, all radio frequencies and LOC IBMH are marked with an asterisk - *

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:

But it does have one before LOC ICWA
What does an asterisk, preceding a frequency, refer to?
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 &quot;D&quot; indicates
DME capability with an asterisk indicating part time.