1.     The main signal is always 3 vertical lights.

2.     Exemption signals are made by a yellow light to the left of the main signal.

3.     Special local signals may be displayed to the right of the main signal.

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Serious emergengy

Stop, or obey instructions

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Vessels shall not proceed

Vessels may proceed

One way traffic

Vessels may proceed

Two way traffic

A vessel may proceed only when she has specific orders to do so

Vessels may not proceed, except that vessels which navigate outside of the main channel need not comply with the main message

A vessel may proceed only when she has recieved orders to do so, except that vessels which navigate outside of the main channel need not comply with the main message