(b) A pilot vessel when not engaged on pilotage duty shall exhibit the lights or shapes prescribed for a similar vessel of her length.

(b) 引航船在不执行引航任务时，应显示与其长度类似的船舶规定的灯光或形状。

(b) A vessel of less than 50 metres in length may exhibit an all-round white light where it can best be seen instead of the lights prescribed in paragraph (a) of this Rule.

(b) 长度小于 50 米的船舶可以在最容易看见的地方展示全方位白光，以代替本规则 (a) 款规定的灯光。