Often the sea conditions prevent safe helicopter operations for support vessels and other ship-based helidecks. Here is an interesting possible solution that really does seem to make a difference - the "roll compensated helideck".
Fire monitor (longer version)
This extended video clearly shows the stages of sea water, foam being introduced and then clean foam/sea water mixture
Fire Monitor
As part of our CAP437 inspection we spend a good deal of time checking the fire fighting and emergency equipment. In this video you can see a test firing of one of the two fire monitors (pointable hose attachments that allow spray or jet). First we get just sea water, then the foam is introduced (it is initially quite dirty) and then we get full on foam and sea water mixture. We also perform a calculation to check that they combined flow rate/output of the monitors is sufficient for the deck size, as well as confirming the foam stocks are large enough to allow a specified minimum application time. You can find further details in Chapter 5 of CAP 437.
The OFS (Obstacle Free Sector) and LOS (Limited Obstacle Sector)
Short but sweet video that explains the OFS and LOS rather nicely. On oil rigs, where usable space is obviously at a premium, new structures springing up in the LOS (without authorisation) is a common and potentially serious problem.
Landing net saves the day
A mistake by the helideck crew leads to a scary situation - fortunately nobody gets hurt. Although the net is too small and not properly secured (as per CAP437) it still does a great job of keeping the helicopter on deck.
