14 Using GPS GeoExplorer Series Getting Started Guide
Using GPS
To use GPS in an application, you need to:
• configure the application to connect to GPS (see page 15)
• get a clear view of the sky (see page 16)
• configure GPS quality control settings to suit your requirements and
the current GPS conditions (see page 16)
You may also want to:
• use mission planning to identify the best times of the day for working
with GPS (see page 17)
• use real-time differential corrections for better accuracy (see page 19)
• use GPS data collection and navigation features (refer to the
documentation for the GPS application).
GPS COM ports
The integrated GPS receiver has three COM ports for communicating with
software on the handheld and with external devices. Using GPS is as
simple as opening the appropriate GPS COM port. Each port is used for a
particular type of communication:
Port Function Description
COM2 NMEA Outputs NMEA-0183 messages. NMEA is a standard
GPS communication protocol used by most GPS
applications.
The handheld outputs the following NMEA messages:
GGA, GLL, GSA, GSV, RMC, VTG, ZDA. All messages are
output at a 1-second interval.
COM3 TSIP Outputs and receives TSIP messages. TSIP (Trimble
Standard Interface Protocol) is used by Trimble GPS
applications, and is also supported by some other GPS
applications.
COM4 Real-time Receives RTCM real-time correction messages. If you
are using an external correction source connected to
COM1 or a Bluetooth port, the corrections must be
redirected to COM4. For more information, see Using
real-time corrections from other sources, page 18.
Note — COM1 is a standard serial port that connects to external devices. For
more information, see Using the optional serial clip, page 34.
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