CAP 437 Offshore Helicopter Landing Areas (7th Edition) (link)
The 7th Edition has been revised to incorporate the full and final specification for the helideck lighting scheme comprising perimeter lights, lit Touchdown/Positioning Marking Circle and lit Heliport Identification ‘H’ Marking. It also includes new ICAO Standards and Recommended Practices relating to offshore helidecks and shipboard heliports that are due to be adopted in March 2013. For the first time requirements were included in the 6th Edition for the design of winching area arrangements located on wind turbine platforms. With the benefit of lessons learned through various industry forums attended since 2008 these sections have been reviewed and updated to represent current best practice.
Source: CAA