Procedures and Practical Operation - VHF

DSC Distress, Urgency and Safety communication procedures

Protection of distress frequencies

  • Avoiding harmful interference
  • Transmissions during distress traffic 
  • Prevention of unauthorised transmissions
  • Test protocols and procedures
  • Avoidance or transmissions in VHF guard bands
  • Procedures to follow when a false or inadvertent Distress Alert is transmitted

Alerting, communication and locating signals