Magellan's GPS Receiver 320 User Manual

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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.

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.

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).