| The speechless code is used in situations where you are unable to transmit speech, for example a microphone failure, or perhaps on very short final when you would rather concentrate on the job in hand than respond to a transmission. | |||
| Transmit | Morse | Meaning | |
| One short | ' | (E) | Yes |
| Two short | ' ' | (I) | No |
| Three short | ' ' ' | (S) | Say again |
| Four short | ' ' ' ' | (H) | Request homing |
| One long | - | (T) | Manouevre complete, steady on heading |
| One long, two short, one long | - ' ' - | (X) | My aircraft has developed another emergency |