NavList:

David wrote

In any multi-crew military aircraft there’s virtually no casual conversation.  Firstly, you’re too busy.  Your operating authority will have laid down strict operating procedures listing actions to be completed every so many minutes.  Secondly the whole crew will hear you, and at least one crew member will probably need to be working undisturbed; conference channels, if they exist and are used at all, are usually reserved for basic training with a screen crew

I was being facetious gven the possible unfortunate results if the navigator said "hack" in a loud voice at the wrong moment.