>I don't have a bug on my DG, and was hoping that the Navaid could
>simply track on a heading. Don't see why not.
How would it sense what heading you were on? It needs
an electrical signal from a device designed to drive
the pointer in a CDI instrument (deviation from
a radial or ground track) or from a device like
heading bug on gyro (deviation from heading).
The Navaid has only a rate sensor (like a
turn coordinator) that deduces heading deviation
by multiplying degrees-per-second turn by seconds
and then working to keep that value "zeroed".
Rate devices and the electronics that integrate their
signals drift, hence variable degrees of ability
to hold a true heading with respect to the earth.
Even if you had a heading bug on the gyro, it too
will drift, abeit more slowly than a rate-based
device, unless it is magnetically slaved to the
earth.
Bob . . .
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