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Subject: Re: [LML] Electric Gyro Compass
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John,  I can say that trying to fly an approach in turbulence with compass, 
TC, and altimeter is a serious pain.
Doing the same with a functioning DG is 5 times better.
....but I don't know if that is your question (what's an AH?  did you mean 
AI?)
AI + portable GPS is probably doable, especially if it's a 396.

My personal requirements are that I can fly an hour with a total electrical 
failure or vacuum failure.
The Chelton's, gns430 and trutrak are a flunk because they are plugged into 
ship's power.
A battery backed mechanical AI + 396 + portable com is my solution.

(okay - actually I have vac dg and ai in addition.   how many times have you 
rebooted your ai this year?)