Channel 83 (157.175 MHz) should not be used in areas where it may interfere with which organization?

• A. The Canadian Coast Guard
• B. The United States Coast Guard
• C. The International Maritime Organization
• D. The Alaska Marine Safety

Answer: (A)

Channel allocations for VHF maritime communications are region-specific and protect critical services from interference. Channel 83, at 157.175 MHz, is reserved for the Canadian Coast Guard. Using that frequency in areas where the Canadian Coast Guard operates could disrupt their operations, including routine communications and important safety or rescue efforts. That’s why it’s not appropriate to use Channel 83 in those areas. In contrast, the United States Coast Guard, the International Maritime Organization, and Alaska Marine Safety have their own assigned channels and responsibilities, so Channel 83 isn’t the one you’d rely on in US or other regions. Always consult your region’s channel allocations to avoid interfering with any active coast guard or safety communications.