OIL AND GAS FIELDS

Production platforms and associated structures, including tanker moorings, 
storage tankers and platforms on pipelines, generally exhibit Mo(U) lights, 
aircraft obstruction lights and audible fog signals. Unauthorised navigation is 
prohibited within 500 metres of all such structures, including storage tankers 
which can swing about their moorings. Tankers manoeuvring in the vicinity of 
platforms and moorings should be given a wide berth. Other uncharted structures, 
both lit and unlit, and submerged installations, some marked by buoys, may 
exist. For further information see the Mariner's Handbook.

