What frequency is primarily used for maritime distress communication?

VHF-FM channel 16 is designated as the primary frequency for maritime distress communication. This channel serves as an international calling and distress frequency, making it crucial for emergencies at sea. It is monitored by vessels and shore stations, ensuring that any distress calls or emergency communications are received promptly.

This frequency is specifically allocated for distress and safety-related communications and is widely recognized and used by maritime operators worldwide. It is essential for facilitating quick response times during emergencies, making it the go-to channel for vessels in distress to communicate with nearby ships or coast guard services effectively.

Other frequencies listed are not primarily used for distress communication. For instance, while VHF-FM channel 14 is used for port operations and certain types of communications, it is not the standard for distress. UHF channel 9 and HF channel 20 are also not standard for maritime distress, which reinforces why VHF-FM channel 16 is the most widely accepted and utilized frequency for such critical communications in the maritime environment.