Specifications

English
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If the period of continuous lock is less than 5 minutes, the
SBAS-corrected position may be more accurate.
When recording a job for post-processing, the receiver records
GPS measurements the entire time the job is open – not just
when you’re recording data into a feature.
Therefore, you do not need to record each feature for more
than 20 minutes. Each feature has to be recorded during a
portion of the job file where you maintained lock on the satel-
lites for at least 20 minutes.
If you open a job, open a point feature 19 minutes later,
record the point feature for 60 seconds and close the feature
and the job, the feature will be recorded during a period last-
ing 20 minutes and you should have sub-meter accuracy.
For this reason, it is best to open the job as soon as you are in
a position to maintain constant satellite lock and close it more
than 20 minutes later.
Lastly, logging a series of GPS raw measurement files instead
of just one degrades accuracy. So unless there is some special
need to open and close multiple raw measurement files, we
recommend you start logging GPS raw measurements before
you log data into the first shapefile and stop logging raw mea-
surements after you close the last shapefile.
For a further discussion of MobileMapper CE accuracy perfor-
mance, please read "MMCEPerformanceWhitePaper.PDF" and
“GPSDifferentialPaper.pdf” found at ftp.magellangps.com in
the \Mobile Mapping\MM CE\Application Notes\ folder.