Ship Codes - Code Oscar

On a ship, a code oscar means someone has gone overboard. 

If the ship has to maneuver erratically to handle the situation, it must also send out blasts on the signal so that other ships nearby are aware of the fact that it is about to change its course. 

A code delta can mean that there is a biological hazard – though who knows what that might be on a passenger ship. 

Code Alpha often means “medical emergency”.