16

Module 4 of 10

Channels & Frequencies

Channel 16, Channel 70, marina/port channels, intership working channels, and when to move off the calling channel.

Channel 16Channel 70 DSCWorking channelsMarina and port traffic

Lesson summaries

Use this module hub to choose the right lesson, then open the dedicated lesson page for the complete explanation, worked examples, FAQs, and practice questions.

Channel 16

Channel 16 is the main distress, urgency, safety, and calling channel. Routine calls should move to a suitable working channel as soon as contact is established.

  • Distress and calling
  • Keep transmissions short
Read the full channel 16 lesson

Working Channels

Marinas, ports, vessel traffic services, and ship-to-ship conversations use assigned working channels. The correct channel depends on the area and service.

  • Use local information
  • Agree a working channel
Read the full working channels lesson

Unlock the complete module

Get every section, quizzes, spaced-repetition flashcards, and mock exams - one-time purchase.