> For the GS, John states that the 'usable' part is only 0.7 degrees > thick. I'm unsure what usable means in that context, but given then > +/- 0.8 DDM range used by the Mk-VIII GPWS, and their dots-to-DMM > factor of 0.0875 for the GS, maximum deviation is 9.142 **dots**. > Clearly that's a much larger deviation that could ever be seen in a > real world-approach. > > Give that definition, it seems unlike that the 'full deviation' (as > opposed to usable) for the GS should be taken as 0.7 degrees, since > that would make each dot 0.076 of a degree - which is an order of > magnitude less than the 0.3 or 0.6 definitions we've been talking about. What I remember from my ifr flight training and the manuals I read, at least for the ki525 HSI the distance between two dots of the GS indicator is 0.35 degrees. There are two dots above and two dots below the center. This calculates as in indicatable range of 0.7 degrees above and 0.7 degrees below glidepath or 1.4 degrees width - or better thickness.
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