IBM G-Mouse GPS Receiver G-Mouse MR Manuale Utente

G-Mouse  GPS  Receiver User Manual 

Page 11 

 
The protocol of G-MR is designed base on NMEA(National Marine Electronics Association) 0183 

ASCII format. The full protocol is defined in  “NMEA 0183, Version 3.01”. 
 

A.1、NMEA Transmitted Message  

G-MR GPS receiver use MediaTek

 

as the core, and output NMEA-0183 standard format message. 

The default communication parameters for NMEA output are 9600 baud, 8 data bits, stop bit, and no 
parity.  

Table  A-1 NMEA-0183 Output Message s

 

GPGGA 

Global positioning system fixed data 

GPGLL 

Geographic position latitude \ longitude 

GPGSA 

GNSS DOP and active satellites 

GPGSV 

GNSS satellites in view 

GPRMC  

Recommended minimum specific GNSS data 

GPVTG 

Course over ground and ground speed 

GPZDA 

Data and Time 

 
A.1.1 Global Positioning System Fix Data (GGA) 

Samples: 
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18 
Table  A-2 GGA Data Format 

Message ID   

$GPGGA   

 

GGA protocol header 

UTC Time 

161229.487 

 

Hhmmss.sss 

Latitude   

3723.2475 

 

ddmm.mmmm 

N/S Indicator   

N   

 

N = north or S = south 

Longitude   

12158.3416 

 

dddmm.mmmm 

E/W Indicator   

W 

 

E = east or W = west 

Position Fix Indicator   

1 

 

See Table4-3 

Satellites Used   

07 

 

Range 0 to 12 

HDOP   

1.0 

 

Horizontal Dilution of Precision 

MSL Altitude 

9.0 

Meters   

Units   

M 

Meters   

Geoid Separation 

 

Meters   

Units   

M 

Meters   

Age of Diff. Corr.   

 

Second Null fields when DGPS is not used 

Diff. Ref. Station ID   

0000 

 

 

Checksum   

*18 

 

 

 

Table  A-3 Position Fix Indicator 

Value 

Description 

0 

0 Fix not available or invalid 

1 

GPS SPS Mode fix valid 

2 

Differential GPS, SPS Mode fix valid