Ben Jackson writes:

RAIM isn't about additional accuracy, that's WAAS. A receiver with
RAIM can't give you a better position fix, but it can tell you when the
the possible error in the position fix has gotten unacceptably large.

How large is unacceptable? For en route navigation you don't have to be
that accurate. Older forms of navigation are considerably less
accurate, and people still use those.

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