Magellan GPS 320 - Manual (Page 60)

52 Magellan GPS 315/GPS 320
NMEA DATA MESSAGES
Your GPS receiver can be set to output GPS data in the NMEA 0183 version
1.5 or version 2.1 format to interface with other marine devices or equipment.
NMEA DATA MESSAGES. NMEA data is output at 4800 baud, 8, N, 1,
checksum off. These settings are acceptable to most equipment and software
applications. The baud rate can also be set to 1200, 9600 or 19200.
There are several NMEA output message sets, each with a slightly different
application. Check documentation for your external equipment to choose
the appropriate message set.
SET OUTPUT/USAGE
V1.5.APA BWC, APA, GLL, VTG
Remote displays, version 1.5 marine autopilots
V1.5 XTE XTE, BWC, GLL, VTG
Version 1.5 Marine autopilots
V2.1 GSA GSA, GSV, GLL, GGA, RMB, RMC and APB. Vers. 2.1
NMEA is recommended for navigation data, satellite
data and autopilots.
NMEA Message Definitions
APA Autopilot cross track error, direction to steer, status of GPS, route status,
destination waypoint name, and bearing from origin to destination
(old format).
APB Revised autopilot message contains all of the above plus: heading to
steer toward destination, bearing from the present position to the
destination (magnetic or true).
BWC Range and bearing to a waypoint.
GGA GPS position, time, fix quality, number of satellites used, HDOP
(Horizontal Dilution of Precision), differential reference information,
and age.
GLL GPS-derived latitude, longitude, and time of fix.
GSA GPS receiver operating mode, satellites used in the navigation solution
reported by the $--GGA sentence and DOP (Dilution of Precision)
values.
GSV Number of satellites in view, satellite numbers, elevation, azimuth, and
SNR value.
RMB Data status, cross track error, direction to steer, origin, destination
landmark, landmark location, bearing to destination, and velocity
toward the destination.
RMC Time, latitude, longitude, speed, heading, and date.
VTG Track (magnetic and true) and groundspeed (knots and KPH).