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Ever wondered if you could get a more accurate GPS reading by taking a number of samples each a few minutes apart? I did, so I collected the data shown below to get an idea how GPS measurements vary with time. Each point is a single location measurement taken from a stationary Garmin eTrex. The sample data was collected automatically by GPS Utility at one second intervals. In all, 1948 samples were collected over 32 minutes 28 seconds, during which time the eTrex was reporting accuracy between 5m and 9m (when checked).
Judging from this data, it would appear that if one wanted to collect a set of more-or-less randomly distributed measurements, it would be necessary to take those individual measurements at quite wide time intervals. The measurements are certainly not randomly distributed on timescales of several seconds or several minutes.
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