🔍 Key Concepts

• VHF Channel 13 purpose under FCC/USCG rules • Difference between ship-to-ship safety of navigation vs. port/harbor control uses • Which services typically involve bridges and locks vs. aircraft communications

💭 Think About

• Ask yourself: Which users MOST commonly need to coordinate close-quarters maneuvers with ships using very short, safety-related messages? • Think about: Do aircraft normally use the same marine VHF channel as ships for routine operations, or do they have separate aviation frequencies? • Consider what type of facility (if any) is allowed to talk directly with ships on the same safety-of-navigation channel used between vessels.

✅ Before You Answer

• Verify which services are associated with safety of navigation and maneuvering in confined waters. • Check which options obviously relate to aircraft, and ask if those are normally on marine VHF Channel 13. • Confirm which remaining option is clearly tied to close-quarters ship movement in restricted waterways (harbors, rivers, canals).