> This is news to me. Which instrument models the drift ? I thought none did
>  , so I created a nasal gyro
> that drifts at 3 degrees/15 minutes for my own use. Apparently I haven't
> looked close enough at the instrument code .
>From heading_indicator.cxx:
    // Next, calculate time-based precession
    double offset = _offset_node->getDoubleValue();
    offset -= dt * (0.25 / 60.0); // 360deg/day
    SG_NORMALIZE_RANGE(offset, -360.0, 360.0);

Durk:
One outstanding feature of FlightGear is: it has so many features, even some 
of our best developers don't know all of them ;-)

Torsten


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