As Troglo says it's just a darned annoyance in most helicopters with useless 'Tail Too Low' warnings or 'Warning Terrain' if you lower the nose more than a few degrees when accelerating to Vtoss during take off. As it's not possible for offshore obstacles to be updated by the user and Honeywell seem incapable of producing a daily or weekly update which could be downloaded for users who could send in updated moving obstacle requirements, it's also pretty useless in the offshore environment. Many pilots I know just pull the CB to shut it up as it constantly distracts their attention during crucial phases of flight
I completely agree with JimL that until such time as Honeywell can produce a proper helicopter-specific EGPWS, capable of daily or weekly updates electronically by the user, it's an expensive waste of fuel or payload at best and a dangerous distraction at worst
