By Telephone 

Look in the front of your telephone directory for an emergency number listing for the U.S. Coast Guard or Dial 911 or call the nearest U.S. Coast Guard Rescue Coordination Center listed on the USCG Rescue Coordination Centers (RCCs) page 

COMMANDANT (CG-5R) 
U.S. COAST GUARD HEADQUARTERS 
2703 MARTIN LUTHER KING JR AVE SE STOP 7516 
WASHINGTON DC 20593-7318 
202-372-2000 

By Radio 
VHF-FM radios are the preferred method for reporting emergencies from vessels on the water. 

Call U.S. Coast Guard on Channel 16 VHF-FM (156.8 MHz) 

Emergency Radio Call Procedures: 
1. Make sure radio is on 
2. Select channel 16 
3. Press/hold the transmit button 
4. Clearly say: "MAYDAY MAYDAY" 
5. Also give: - Vessel name and/or description 
- Position and/or location 
- Nature of emergency 
- Number of people on board 
6. Release transmit button 
7. Wait for 10 seconds - if NO response repeat call. 
 
* Intentional hoax calls are an offense and subject to prosecution (see Hoax information page). 

By Cellular Phone 
Cellular phones are an acceptable secondary means of calling the Coast Guard. 

Look in the front of your telephone directory for an emergency number listing for the U.S. Coast Guard or Dial 911 or call the nearest U. S. Coast Guard Rescue Coordination Center listed on the USCG Rescue Coordination Centers (RCC's) page 

By Email 

Currently the U.S. Coast Guard email system is not set up to accept or respond to emergency SAR messages. If you are in distress or need to report an emergency, do NOT send it via email, contact the Coast Guard via telephone or radio. 

By other methods 

The Global Maritime Distress and Safety System (GMDSS) provides several additional means for contacting or alerting SAR authorities. These include INMARSAT, SARSAT (EPIRBs, ELTs, and PLBs), MF-DSC, HF-DSC, etc. 

In addition, for vessels or persons in distress there are nationally and internationally accepted/prescribed visual and sound distress signals (flares, horns, mirrors, flashing lights, flags, etc.).