Interpreting the orientation of the H letter to land on helidecks
Although landing with the pilot seat on top of the inner edge of the aiming circle ensures that a helicopter with maximum dimension D is clear from obstacles while on deck, not all conceivable landing paths to get there are safe. Without bringing the relative wind into the equation, safe landing paths would be those where the helicopter moves towards the aiming circle from positions where it is entirely within the boundaries of the obstacle-free sector (OFS).
Although the chevron provides a visual cues about the OFS, the chevron is not a reference for the flight crew, but for the HLO. What, then, could be a source of OFS-related visual cues for the flight crew? That would be orientation of the H, of which the cross bar is in line with the bisector of the chevron. Although the H won't provide precise visual cues about the boundaries of the OFS, at least it helps to know what is the helideck (half) sector where any landing path can be performed wiht the helicopter entirely within the the OFS.
Therefore, it seems to me that properly interpreting the orientation and relative position of the H is safety-critical skill for offshore helicopter pilots.
I would much appreciate to know your thoughts about that.