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Connecting the NS25 to Optional Devices
NMEA
The NS25 can relay position, speed and course information to an autopilot or other NMEA device.
The NS25 uses a standard format for computing this information called an NMEA 0183 (v2.0).
This standard is defined by the National Marine Electronics Association, and is commonly used
by most marine electronics manufacturers. The output comes from the "Y" cable at the control
head. It broadcasts this information out in APB (Autopilot Sentence "B", contains navigation
receiver warning flag status, cross track-error, waypoint arrival status, initial bearing, and
continuous bearing) and BWR (time and bearing to, and location of, a specified waypoint from
present position) sentences.
The wire connectors are output "talk" only. The red wire is the signal (NMEA line "A" ) and the
black wire is ground (NMEA line "B" ).
DGPS
The NS25 is compatible with DGPS (Differential Global Positioning System), which uses radio
tower signals to enhance position accuracy. These signals are available in select areas, check
your area of operation for DGPS coverage.
DGPS input uses an RS-232 serial connection and accepts data in the RTCM SC-104 data
format. It is compatible with Communications System International (CSI) model MBX-2 and
Magellan model DBR.
The red wire is used for signal and the black wire is used for ground.
The NS25 should be set at a baud rate of 4800 or 9600 (default), whichever is compatible with
your Differential Beacon Receiver. This setting is made in the Set-Up menu (see "Using the
Menu" – Set-Up for more information).
If connected, check DGPS field in the System Status view to confirm unit is receiving correction
signal. If "NONE" displays in the field (indicating that it is not receiving), try toggling between both
baud rates and check connections. Refer to your DGPS manual for further instructions.
Maintenance and Warranty....
Specifications
Sonar
Operating Frequency 200 kHz
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