From a compliance/regulatory capacity, absolute mandates are better for both the adjudicators and the participants. With Compasses that can have the GPS/VMG/Speed turned off, a de facto mixed standard for compliance is created, if the rule language is vaguely described.

I'd be happier if the rule language is black or white, (no wiggle room). They are or they are not legal.

Also, I can only find 2010 rules. Maybe I'm looking in the wrong place for the 2011 rules. The amendments don't mention anything about GPS as far as I can see. I remain confused as to what represents the status quo, (and have been now for about a year).