AirQ.....I 'm not sure where Honeywell gets their accelerometers(probably manufacture their own)....but they are so accurate that if you try to Align IRU with wrong latitude , the accelerometers can measure the rotation of the earth and the IRU will not align and show a fault until correct Latitude is keyed in.......most of internal components of IRU or ADIRU and proprietary.....due to their commonality with military configurations............but I am interested on how you resolve this issues........keep us posted..........while were on this sort of topic.....have any of you gentlemen tried any of the newer telemetry systems?.............I would like to try it on my Hangar 9 Cessna 182 and eventually move it to my Multi-engine warbirds...........airspeed/altitude/engine RPM would be what I'm most interested in.............Bill