[Lf] Magellan GPS

[David L. Wilson]

At 05:39 PM 5/4/00 -0400, you wrote:
...

>> Since SA was turned off, over the last two hours the mean position of my
>> house has drifted just 2 metres RMS with an absolute worst case shift of
>> 3.6m. 

Note that 2 hours is far too short to get an accurate error estimate and
that long term errors make usiong the mean possition not an accurate way of
estimating the true position.  Doing either of those will cause the error
to be under estimated.  See
 http://www.erols.com/dlwilson/nosa.htm
for the results using a Garmin 12XL for 3 days at a surveyed point.

 I