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8
CONNECTIONS AND INSTALLATION
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GPS antenna connection
NOTE:
Be sure the GPS antenna is positioned where the GPS antenna has a clear
view to receive signals from satellites.
D
Installation
1. Mount the bracket securely to the desired position.
L
Screws for mounting the bracket are user supplied.
2. Insert the GPS antenna to the bracket, and then
rotate it clockwise until it is completely tightened.
D
Connection
z
Insert the GPS antenna cable to the GPS antenna
connector, and then rotate it clockwise until it is
D
Attention
About calculating position
The GPS antenna acquires signals from GPS satellites. It calculates its position by the
orbit information of the GPS satellites and needs to measure the distance between itself
and three or more GPS satellites to obtain a reliable position. The GPS antenna acquires
all available satellites when it is powered up. Normally, it takes approximately 1 minute to
determine a position.
In places where the GPS signals cannot reach the GPS antenna, it may show position
errors (misplacement) or no position reading at all.
As the satellites are continuously moving, measurement of the position or time by
the GPS antenna may take a while, and/or no position reading can be made in some
instances. Even if the GPS antenna acquires signals from three or more GPS satellites, it
may take a longer time to determine a position depending on the satellite locations.
Location precision
The GPS device automatically calculates its position when it acquires signals from three
or more GPS satellites.
The position error using the GPS is about ±10 meters. However, this can vary up to
several hundred meters, depending on the surrounding environment. The GPS information
and its accuracy varies, depending on the GPS system being acquired, place and time.
About NMEA sentences
When the current position data cannot be received due to the GPS signal being blocked
by something, the GPS antenna sends the last memorized NMEA sentence, but the
sentence may include invalid data.
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