There isn't a command duty officer when underway - the operational chain when it comes to shiphandling is Captain->OOD->Conning officer. Even on smaller boats l

There isn't a command duty officer when underway - the operational chain when it comes to shiphandling is Captain->OOD->Conning officer. Even on smaller boats like minesweepers there'll still be a conning officer, though often it's a more senior enlisted.