It depends on the situation. The international maritimedistress frequency is channel 16, which is 156.80 MHz. The international civilian airband distress frequency is 121.5 MHz.
VHF Chanel 16
VHF Chanel 16
In the United States, the safety and distress calling frequency for boats is primarily set at VHF Channel 16 (156.800 MHz). This channel is used for emergency communications, including distress calls and safety announcements. Boat operators are required to monitor this frequency when underway, as it is the primary channel for distress signaling and coordination with the Coast Guard and other vessels in case of emergencies.
Vhf Channel 16
121.5 MHz.
VHF Chanel 16
Channel 16
Channel 16
You start calling him twice the frequency and do no say anything You start calling him twice the frequency and do no say anything
Channel 16
channel 16 I am a former USCG Radioman. Make sure you are using a marine band radio otherwise the channels do not line up. The frequency you need is 156.800Mhz. Also the you use that for calling also. Then the USCG if it is not a distress call will switch you to a working frequency that is usually ch 22 or 157.100Mhz. Also for hf the frequency is 2182Khz. Used to use 500Khz for Morse code but it is not monitored anymore. This was a real problem when I was stationed in Portland ME as they Canadian Fishing fleet used 22 as its working frequency so they were always stepping on us when we were working on 22.
The VHF marine radio communication system reserves channel 16 as a calling and distress channel. This channel is used for initiating communication and for broadcasting distress signals in case of emergencies at sea.