GT Series

Yuechung International Corp. (YIC)

5

URL: www.yic.com.tw

E-mail: service@yic.com.tw

Y

YI

IC

C

3. NMEA 0183 Protocol

The NMEA protocol is an ASCII-based protocol, Records start with a $ and withcarriage return/line feed. GPS

specific messages all start with $GPxxx where xxx is athree-letter identifier of the message data that follows.

NMEA messages have achecksum, which allows detection of corrupted data transfers.

GT-503(M)GB support the following NMEA-0183 messages: GGA, GLL,GSA, GSV, RMC and VTG.

Table 1: NMEA-0183 Output Messages

NMEA

Description

GGA

Global positioning system fixed data

GLL

Geographic position - latitude/longitude

GSA

GNSS DOP and active satellites

GSV

GNSS satellites in view

RMC

Recommended minimum specific GNSS data

VTG

Course over ground and ground speed