(a) A vessel engaged on pilotage duty shall exhibit:
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(i) at or near the masthead, two all-round lights
in a vertical line, the upper being white and the lower red;
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(ii) when underway, in addition, sidelights and
a sternlight;
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(iii) when at anchor, in addition to the lights
prescribed in subparagraph (i), the light, lights or shape prescribed
in Rule 30 for vessels at anchor.
(b) A pilot vessel when not engaged on pilotage
duty shall exhibit the lights or shapes prescribed for a similar vessel
of her length.