ULTRACOM DOG-GPS, Руководство пользователя

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The GPS (global positioning system) is operated
by the United States government, which is solely
responsible for accuracy and maintenance of
the system. The accuracy of location data can be
affected by adjustments to GPS satellites made
by the United States government and is subject
to change with the United States Department
of Defense civil GPS policy and the Federal
Radionavigation Plan. Accuracy can also be
affected by poor satellite geometry. Availability and
quality of GPS signals may be affected by buildings
and natural obstacles, as well as weather conditions.
The GPS receiver should only be used outdoors to
allow reception of GPS signals. GPS should not be
used for precise location measurement, and you
should never rely solely on location data from the
GPS receiver.
* DoGPS TX112 / 114