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RTCM 104
The GlobalMap 2000 can “talk”
to the beacon receiver using
RTCM104, a standard commu-
nications language. With this
protocol, all you need to do is
set the baud rate to the same as
the one used by your beacon
receiver. The unit’s default is
4800 baud. If your unit uses a
different baud rate, press the
key next to the “Serial Commu-
nication” label. A new screen
appears with different baud rate
labels. Press the key next to the
desired label, then press the
CLR key. If the beacon receiver
is connected and turned on, dif-
ferential correction data should
now be received by the map-
ping unit. Press the CLR key to
exit this screen.
Lowrance, Starlink, and
Magnavox Beacon Receivers
The Lowrance, Starlink and Magnavox beacon receivers must have the
frequency and bit rates set.
Most DGPS transmitters have different frequencies and bit rates. The
GlobalMap 2000 needs to know the frequency of the transmitter and its bit
rate that you will be using with the Lowrance, Starlink, or Magnavox beacon
receivers. To enter the DGPS transmitter’s frequency, first select the
desired receiver. Now press the key next to the DGPS Beacon Frequency
label. Using the numbered keys, enter the frequency of the transmitter.
Press the ENT key when you’re finished. Next, press the key next to the
“DGPS Beacon Bit Rate:” label. Enter the bit rate, again using the
numbered keys. Press the ENT key when you’re finished. If you have a
Starlink beacon receiver, you may not have to enter the frequency or the
bit rate. Simply press the key next to the “Automatic Mode” label and the
Starlink receiver will tell the GlobalMap 2000 the transmitter frequency and
bit rate, automatically.
When you’re finished with this screen, press the CLR key. The GlobalMap