"Jeff" wrote in message ...
If you start with a fix, you don't accumulate error each day, only when
you change stars. In other words, as long as you can use the same set of
stars, you only have one sight's worth of error. In theory, if you have a
large number of stars, you can go quite a while, since three good LOPs
would count as a new fix.


Please don't say "fix" in front of Capt. JG. He might be inclined to suffer
a relapse.

--
Gregory Hall