Non-Directional Beacons (NDBs)

This page provides information on offshore NDBs, the associated frequency assignments and the engineering requirements which need to be met in order to be granted ANO approval.

Whilst there is no mandatory CAA requirement to install and operate an Offshore NDB on Fixed, Mobile Installations or Vessels, the helicopter service provider may insist on one being installed and operated under certain circumstances, for example, where there aren’t other navigation facilities in the particular area of operation. CAP 670 ATS Safety Requirements Part C, Section 2 Navigation, NAV 02 ‘Engineering Requirements for MF Non-Directional Beacons’ should be consulted for further information. 

Unfortunately it is not possible to issue WT Act Aeronautical Licences or ANO Approvals for NDBs operating on the fixed maritime frequency of 410 kHz as this is not within the aeronautical spectrum.

At the time of the first application the CAA will assign a two or three letter identification code for each Aeronautical NDB which may take between 4 and 6 weeks to obtain depending on the international co-ordination necessary.  The ship maritime radio callsigns are not permitted to be used for the NDB identification as they do not conform to the Aeronautical Standards.