Merchant Shipping Act, 1951 (Act No. 57 of 1951)RegulationsMerchant Shipping (Collision and Distress Signals) Regulations, 2005Annex I : Positioning and Technical Details of Lights and Shapes13. High-speed craft* |
| (a) | The masthead light of high-speed craft may be placed at a height related the breadth of the craft lower than that prescribed in section 2(a)(i) of this Annex, provided that the base angle of the isosceles triangles formed by the sidelights and masthead light, when seen in end elevation, is not less than 27 degrees. |
| (b) | On high-speed craft of 50 metres or more in length, the vertical separation between foremast and mainmast light of 4,5 metres required by section 2(a)(ii) of this Annex may be modified provided that such distance shall not be less than the value determined by the following formula: |
| where: | y is the height of the mainmast light above the foremast light in metres; |
| a | is the height of the foremast light above the water surface in service condition in metres; |
| Ψ | is the trim in service condition in degrees; |
| C | is the horizontal separation of masthead lights in metres. |
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*Refer to the International Code of Safety for High-Speed Craft, 1994, and the International Code of Safety for High=Speed Craft, 2000.