On Sun, 12 Jun 2005 14:19:32 -0700, Peter
wrote:

Main reason is that other planes will be using pressure-based altimeters
so maintaining separation can only be done when everyone uses the same
method with the same errors.

Boaters run into this problem all the time (as it were). The GPS is
more accurate than the chart. Not a problem when it comes to buoys,
since NOAA uses GPS now when setting them in place, but a big problem
when it comes to rocks. They were charted by optical means.


-- all the best, Dan Ford

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