When working in a voice system, it is important that the picker can easily understand the instruction given by the voice computer. Navigator's voice module uses the phonetic alphabet when speaking to the operator. Rather than saying "ae, bee, cee, dee", the system will speak the word from the list below - "alpha, bravo, charlie, delta" etc.
| Letter | Pronunciation |
| a | alpha |
| b | bravo |
| c | charlie |
| d | delta |
| e | echo |
| f | foxtrot |
| g | golf |
| h | hotel |
| i | india |
| j | juliet |
| k | kilo |
| l | lima |
| m | mike |
| n | november |
| o | oscar |
| p | papa |
| q | quebec |
| r | romeo |
| s | sierra |
| t | tango |
| u | uniform |
| v | victor |
| w | whisky |
| x | x-ray |
| y | yankee |
| z | zulu |