Marco Leon writes:

Agreed. However, having a choice of signals to "believe," the FMS
should have an integrity check in its logic, right? If the VOR-NAV is
showing you 3 miles to the left of the localizer and the GPS and INS
are showing you on it, then the FMS should disregard the VOR-NAV.

Yes, it should have such checks, and it does.

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