Magellan GPS 310 - Manual (Page 40)

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NMEA Data Messages
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.
Your GPS receiver outputs the following NMEA 0183 version
2.1 messages.
GSA, GSV, GLL, GGA, RMB, RMC and APB.
Vers. 2.1 NMEA is recommended for navigation data,
satellite data and autopilots.
NMEA Message Definitions
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).
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.