Lowrance electronic GlobalMap 12 - Manual (Page 50)

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press the right arrow key. Next, highlight the “Position Format” label and
press the right arrow key. A screen similar to the one at the bottom of the
previous page appears. Highlight the desired position format then press
the EXIT key to select the format and erase the menu.
NMEA / DGPS
The GlobalMap 12 transmits data through the data port in the back of the
unit using NMEA 0183 format, version 1.5 or 2.0. This data is used by
other electronic devices such as marine autopilots for position and steer-
ing information.
DGPS on the other hand, is a data input. DGPS is an acronym for Differ-
ential Global Positioning System. Currently, it relies on a system of ground-
based transmitters that send correction signals to small DGPS receivers.
These receivers connect to the GlobalMap 12 through the data port. DGPS
gives you more accurate positions than is otherwise possible.
Lowrance makes the “Lowrance DGPS Beacon Receiver” that receives
the DGPS signal broadcast by the Coast Guard at many locations around
the United States. One benefit of this system is that the Coast Guard
doesn’t charge for the use of this service. You can attach the DGPS Bea-
con Receiver to your GlobalMap 12 and start using it immediately. How-
ever, please note that the Lowrance DGPS Beacon Receiver is designed
for permanent mount on a boat or other vehicle. It requires a four to eight-
foot whip antenna.
See the sample wiring diagrams on the next page for general wiring pro-
cedures. You’ll need to purchase a NDC-1 adapter cable for your GlobalMap
12 Sport’s data port to connect to the DGPS receiver.
(Note: Connecting power to the GlobalMap 12
through the NDC cable as shown in the diagrams
is optional. However, the shield wire must still be
connected to ground.) Once the cables are wired,
turn the GlobalMap 12 on, press the menu key,
and select NMEA / DGPS from the System Setup
menu. A screen similar to the one at right appears.
NMEA 0183 OUTPUT
To turn the NMEA output on, highlight the “NMEA 0183 OUTPUT” menu,
then press the right arrow key. If the other equipment works, then no setup
will need to be performed. If your the equipment doesn’t recognize the
NMEA data being sent by the GPS receiver and the wiring is correct, then
you may need to change the NMEA or the serial communication settings.