Whilst at sea and outside Sea Area A1 all non-Solas vessels should maintain continuous watch on 2182 kHz. This facility allows the operator to monitor 2182 kHz and any number of other frequencies in a rapidly changing sequence. The receiver stays on the frequency on which the transmission is being made. The frequency can be manually advanced to the next frequency in the scan sequence or inhibited from the scan cycle.

Practise on a MF/HF radio simulator

To start scanning, press the Sc button.
Use the NEXT softkey - to switch to the next scanning type
Use the CHANGE softkey - to edit the scanning frequency
Use the CANCEL softkey - to cancel scanning
Use the STOP softkey - to stop scanning

The following scanning types are available.
Telephony watch:
Up to 10 telephony channels.
Scanning rate is approx. one channel per 2 sec.
Multi watch:
A single DSC frequency (normally 2177 kHz) and up to 10 telephony channels.
Scanning rate is approx. one channel per 2 s. The DSC frequency is monitored briefly at each telephony channel shift.
Dual watch:
A single DSC frequency (normally 2177 kHz) and the current telephony frequency.
The DSC frequency is monitored briefly at approx. each 2 s.
DSC watch:
Up to 6 DSC frequencies.
Scanning rate is approx. 6 DSC frequencies per 2 sec.