| letters | phonetic 
                        alphabet | meanings | 
                   
                    | A | Alfa | Diver 
                      below, OR undergoing speed trial | 
                   
                    | B | Bravo | taking 
                      or discharging explosives | 
                   
                    | C | Charlie | Affirmative/Yes | 
                   
                    | D | Delta | Keep 
                      clear; Maneuvering with difficulty | 
                   
                    | E | Echo | Altering 
                      course to starboard | 
                   
                    | F | Foxtrot | Disabled, 
                      communicate with me | 
                   
                    | G | Golf | Need 
                      a pilot | 
                   
                    | H | Hotel | I 
                      have a pilot | 
                   
                    | I | India | Altering 
                      course to port | 
                   
                    | J | Juliette | I 
                      will send you message by semaphore; On fire with dangerous 
                      cargo, keep clear | 
                   
                    | K | Kilo | You 
                      should stop your vessel instantly. Wish to communicate | 
                   
                    | L | Lima | You 
                      should stop, I have something important to communicate | 
                   
                    | M | Mike | I 
                      have a doctor on board. Stopped and makingno way through 
                      the water | 
                   
                    | N | November | Negative/No | 
                   
                    | O | Oscar | Man 
                      overboard | 
                   
                    | P | Papa | "The 
                      Blue Peter" All aboard, vessel is about to proceed. 
                      At sea: your lights are out or burning badly | 
                   
                    | Q | Quebec | My 
                      vessel is healthy and I request free practique | 
                   
                    | R | Romeo | The 
                      way is off my ship. You may feel your way past me | 
                   
                    | S | Sierra | My 
                      engines are going full speed astern | 
                   
                    | T | Tango | Do 
                      not pass ahead of me, Keep clear, engaged in pair trawling | 
                   
                    | U | Uniform | You 
                      are coming into danger | 
                   
                    | V | Victor | I 
                      require assistance (not distress) | 
                   
                    | W | Whiskey | I 
                      require medical assistance | 
                   
                    | X | X-ray | Stop 
                      what you're doing and watch for my signals | 
                   
                    | Y | Yankee | I 
                      am carrying mails; dragging my anchor | 
                   
                    | Z | Zulu | To 
                      be used to address or call shore stations. Require tug | 
                
                
                   
                    | signal 
                        flags | meanings | 
                   
                    | NC | I 
                        am in distress  | 
                   
                    | AC | I 
                        am abandoning my vessel | 
                   
                    | AN | I 
                        need a doctor | 
                   
                    | BR | I 
                        require a helicopter | 
                   
                    | CD | I 
                        require immediate assistance | 
                   
                    | DV | I 
                        am drifting | 
                   
                    | EF | SOS/MAYDAY 
                        has been canceled | 
                   
                    | FA | Will 
                        you give me my position? | 
                   
                    | GW | Man 
                        overboard. Please take action to pick him up | 
                   
                    | JL | You 
                        are running the risk of going aground | 
                   
                    | LO | I 
                        am not in my correct position: used by a light vessel | 
                   
                    | PD | Your 
                        navigation lights are not visible | 
                   
                    | PP | Keep 
                        well clear of me | 
                   
                    | RU | Keep 
                        clear of me; I am maneuvering with difficulty | 
                   
                    | QD | I 
                        am going ahead | 
                   
                    | QQ | I 
                        require health clearance | 
                   
                    | QT | I 
                        am going astern | 
                   
                    | QU | Anchoring 
                        is prohibited | 
                   
                    | QX | I 
                        request permission to anchor | 
                   
                    | SO | You 
                        should stop your vessel instantly | 
                   
                    | UM | The 
                        Harbor is closed to traffic | 
                   
                    | UP | Permission 
                        to enter Harbor is urgently requested. I have an emergency | 
                   
                    | YU | I 
                        am going to communicate with your station by means of 
                        the International Code of Signals | 
                   
                    | ZL | Your 
                        signal has been received but not understood.  |