Ag Leader GPS 1100 Operators Manual - Manual (Page 5)

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General
Information Wide Area Augmentation System (WAAS) differential correction is an
alternative to subscription based satellite differential correction.
IMPORTANT: WAAS is currently free of charge, and is
being funded by the Federal Aviation Administration (FAA).
WAAS is currently in test mode, and Ag Leader Technology
can not guarantee the availability or quality of its position
signals. Only two (2) WAAS satellites are currently covering
North America.
The GPS1000/GPS1000+/GPS1100 requires no initial setup to begin
fieldwork. The PF3000, (Figure 1), YM 2000, (Figure 2), or Insight
yield monitor will display a "D" or "G" on the top right hand corner of
the display to indicate a GPS signal. A "D" indicates that a differential
signal is being received. A "G" indicates that you have a GPS signal and
your GPS receiver is tracking four or more satellites (which means you
can get an elevation reading). A lower case "g" indicates that you have a
GPS signal but your GPS receiver is tracking only three satellites, which
means you cannot get an elevation reading. Your GPS receiver must
track four or more satellites to get an elevation reading.
The unit is defaulted to 4800-baud, 8, N, 1, 1Hz output. One position is
output per second using GGA and VTG NMEA messages by default.