NAVTEX receiver sample

Transmitted NAVTEX messages can be received by the NAVTEX receiver, which comprises a small unit containing:

• a radio receiver, fixed tuned to the NAVTEX frequencies (it can be single or dual frequency receiver - the last one is capable to receive message on 518 kHz and 490 kHz frequencies without tuning the receiver),
• a signal processor,
  
• a small keyboard (for setting up and operating the NAVTEX receiver),
• a display and/or a continuous paper feed (for displaying or printing the received MSI),
  
• a memory for storing received messages and
• antenna system.

The SOLAS convention requirements

SOLAS vessels must carry a dual frequency receiver if reception on 490 kHz is required since availability to receive messages on 518 kHz must be maintained at all times, or they must carry two single frequency receivers tuned on different frequencies. A receiver should comprise (for displaying or printing the received MSI) either:

• an integrated printing device or
• a dedicated display device and printer output port or
• a connection to an integrated navigation system.
  

On a non SOLAS vessel, it is feasible to have a single frequency receiver. The user can switch to the 490 kHz frequency for reception of a message (at a scheduled transmission time) and then switch back to the 518 kHz frequency when the message has been received.