Course indication

When motor boats are in sight of one another, on taking any course authorised or required by these Regulations, they shall indicate that course by the following signals52 Harbours and Merchant Shipping One short blast to mean - “I am directing my course to starboard (to right hand).” Two short blasts to mean - “I am directing my course to port (to left hand).” Three short blasts to mean - “My engines are going full speed astern.” One prolonged blast to mean - “You may pass me now.”.