How Accurate Is Gps - Garmin nuvi 215 Owner's Manual

How Accurate Is GPS?

GPS technology depends on the accuracy of signals that travel from GPS
satellites to a GPS receiver. You can increase accuracy by ensuring that when
you use (or at least when you turn on) your GPS receiver, you are in an area
with few or no obstacles between you and the wide open sky. When you fi rst
turn on your GPS receiver, stand in an open area for a few moments to allow
the unit to get a good fi x on the satellites (especially if you are heading into
an obstructed area). This gives you better accuracy for a longer period of time
(about 4-6 hours).
50
How Accurate Is GPS?
It takes between 65 and 85
milliseconds for a signal to travel from
a GPS satellite to a GPS receiver on
the surface of the earth.
The signals are so accurate that time
can be fi gured to much less than a
millionth of a second, velocity can be
fi gured to within a fraction of a mile
per hour, and location can be fi gured to
within a few meters.
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