The RFM it must be remembered, is a certification document and is rarely, due to a singular lack of context, a handbook that relates to the real world and its problems.
The Cat A offshore procedures cannot possibly take into account the multitude of possible obstacle/turbulence situations that routinely change on a daily basis. They therefore have to be understood in this context or you simply turn around and go home anytime the text-book conditions are unavailable.
LDP is a point only you, the pilot conducting the landing, can nominate and is strictly the point at which you feel you can no longer make a safe go around and you are therefore committed to a landing.
The proximity of flare booms, crane barges, work-over barges, pipe-layers plus the known presence of troublesome turbulence will shape your decision. As the senior risk-manager on site you have the responsibility for deciding when the risk associated with a difficult approach is not worth the candle.
G.
