Eagle Electronics AccuMap 12 - Manual (Page 49)

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Press the up or down arrow keys to highlight the desired position format.
Press the EXIT key to select the format and erase the menu.
NMEA / DGPS
The AccuMap 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 AccuMap 12 through the data port. DGPS
gives you more accurate positions than is otherwise possible.
Eagle makes the “Eagle 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 Beacon Receiver to
your AccuMap 12 and start using it immediately. However, please note
that the Eagle 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 AccuMap
12 Sport’s data port to connect to the DGPS receiver.
(Note: Connecting power to the AccuMap 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 AccuMap 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 your other equipment works, then no
setup will need to be performed. If your other equipment doesn’t recog-
nize 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 communi-
cation settings.