To port, or starboard, back, or stop her!
“But when upon your port is seen
A steamer’s starboard light of green,
There’s not so much for you to do,
For green to port keeps clear of you.”
4. All ships must keep a good look-out, and steam-ships must stop, and go astern, if necessary.
“Both in safety and in doubt
Always keep a good look-out;
In danger, with no room to turn,
Ease her—stop her—go astern!”