IPS recommends offsets in any airspace where ATC might be compromised, whether in Class I or Class II airspace.  Somewhat like SLOP, we have extended our decade old policy for Africa to any region where GPS and RVSM accuracy have the potential of delivering aircraft radome to radome with any gaps in traffic management.  Offsets are always within the containment value of the airspace (.1 to .7 nm right of course) and intended to miss other traffic. 

 See the editorial in ProPilot's December  2006, issue ( Outer Marker Inbound ).