What is the minimum distance for proper VHF radio communication to a shore station under the first digital sea area?

The correct minimum distance for proper VHF radio communication to a shore station under the first digital sea area is 20 nautical miles. This distance is established as a standard for ensuring effective communication, particularly in areas where VHF radio is the primary means of communication for safety and operational purposes.

In the first digital sea area, known as the "Area of VHF Communication," the 20 nautical mile range is significant because it typically ensures that vessels can maintain contact with shore stations, which is crucial for receiving navigational warnings, weather updates, and emergency communications. This range aligns with the capabilities of VHF radio systems, which, under optimal conditions, can transmit and receive signals effectively within this distance.

Understanding the importance of maintaining this range aids in ensuring safety at sea and is critical for compliance with communication regulations. This knowledge is especially vital for operators who must be prepared for emergencies and maintain communication with maritime authorities.