Considerations / observations

Printer-friendly versionPDF version

Needs to be filled in




  1. That any evaluated technologies have a clear migration path from the current analogue voice services to the new digital voice services by allowing both the digital and analogue services to co-exist in the same transceiver for the duration of the entire migration period. This could extend to using the same antenna and other existing physical installation hardware.
  2. The channel efficiency should be a high priority, by allowing four (4) or more digital voice channels for each 25kHz maritime VHF voice channel.
  3. The digital service includes the capability of transmitting the location of the radio for the entire duration of the digital voice conversation.
  4. The digital service allows a Short Message Service (SMS) without the need to set up a digital or other voice call.
  5. The digital voice quality be similar to, or better than, the analogue voice service, especially using weaker radio signals at the extent of the radio coverage.

Trials / reports



  1. That the candidate technologies are easy to use by the users and limit the possibility of the users to make mistakes
  2. That the candidate technology is independent of other (supporting) technology (like GPS) and manufacturer (no vendor lock)
  3. Support the current functionality of VHF radio (DSC / ATIS)
  4. Costs of the equipment is around the same as current.
  5. Impact on current regulations is minimal (appendix 18)
  6. The candidate technology, with most of the requested functionality, should be already be available
  7. The candidate technology should be future-proof
  8. Could support (Cyber) security for instance to check your own transmissions.
  9. Support of Smart Shipping, for instance sending small data packets with the intentions of the ship.
  10. Harmonized
  11. Should be implemented using open standards
  12. Be able of shutting down a transmitter remotely
  13. Be able to limit the maximum time of one conversation
  14. Be able of integration GMDSS (DSC, MSI)
  15. Capable of dual watch functionality
  16. Identification integration embedded in signal like MMSI, Callsign or ATIS for the entire duration of the digital voice conversation
  17. Be able to switch automatically between analog and digital voice transmissions
  18. Capable of detection of poor signal
  19. Capable of detecting of interference
  20. To be able to cope with multicast / diversity
  21. Support (half) duplex
  22. Possible of to dedicate one digital channel for data only
  23. Support multi languages by voice and user interface.
  24. Tests were in perfect weather/communication conditions, so how does it operate when not?
  25. Must have an interface to connect to other bridge equipment for instance obtaining ships position from it’s centralised positioning system.
  26. How can you detect destruction of the signal, like with analogue.
  27. Would the repeater and trunking possibilities enhance communication and safety in a Port or traffic dense area?