SASless - if I might take the opportunity to answer,
Thanks to Mars for reminding us; it was not an article but something that I wrote in response to the discussions in the S92 thread about 18 months ago.
As far as the speed goes; yes the decks are sometime moving. The difference of approach speed/manoeuvre to the classic modes might not be apparent when comparing aircraft IFR procedures onshore, but is when considering flights offshore.
The original reason for the quoted post was to postulate that, for offshore operations, the EGPWS algorithm would benefit from being modified. Not only does the Enhanced mode need the presence of real-time sensors - to address the dynamic obstacle environment - the protection envelope provided by the six classic modes also needs to be redefined.
Because of the less complex operating conditions (some elements of which are described in the bullet points), and because we already have terabytes of data describing offshore operations (from the HOMP/FDA programs), the provision of definition of a safe offshore operating envelope would not be impossible to achieve.
An extremely worthwhile research project that would not cost a great deal of money or time to conduct (providing the data is made available - as I'm sure it would). The provision of a safe operating envelope might have also mitigated for the Cormorant Alpha accident, which appeared to be caused by the helicopter being put into an unsafe regime whilst turning downwind in strong winds.
Jim