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Software Data 
NMEA V2.2 Protocol 
It is the RS-232 interface:4800 bps, 8 bit data, 1 stop bit and no parity.   
  NMEA Output Messages 
The Sapphire outputs the following messages as shown in Table 1: 
TABLE 1    NMEA OUTPUT MESSAGES 
NMEA Record 
Description 
GGA 
Global positioning system fixed data 
GSA 
GNSS DOP and active satellites 
GSV 
GNSS satellites in view 
RMC 
Recommended minimum specific GNSS data 
GGA
Global Positioning System Fixed Data   
Table 2 contains the values of the following example:   
$GPGGA, 161229.487, 3723.2475, N, 12158.3416, W, 1, 07, 1.0, 9.0, M, , , ,0000*18 
TABLE 2 GGA DATA FORMAT 
Name Example 
Units 
Description 
Message ID 
$GPGGA 
 
GGA protocol header 
UTC Position   
161229.487 
 
hhmmss.sss 
Latitude 3723.2475 
 
ddmm.mmmm 
N/S Indicator 
 
N=north or S=south 
Longitude 12158.3416 
 
dddmm.mmmm 
E/W Indicator 
 
E=east or W=west 
Position Fix Indicator 
 
See Table 5-1 
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 
 
 
<CR><LF> 
 
 
End of message termination