| Answer | Crossword Clue |
|---|---|
| SOS | Signal for the USCG |
| SOS | USCG signal |
| CUE | Signal for the next speech. |
| ZULU | Signal word for the last letter |
| NOCATCH | Its signal is the same as that for "safe" |
| SOS | Signal that had only existed for a few years when the RMS Titanic used it |
