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SPSx80 Smart GPS Antenna User Guide     

NMEA-0183 Output     

An example of the GGA message string is shown below. Table A.3 describes the 
message fields.

$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,
2,6,1.2,18.893,M,-25.669,M,2.0,0031*4F

Table A.3

GGA message fields

0

message ID $GPGGA

1

UTC of position fix

2

Latitude

3

Direction of latitude:

N: North

S: South

4

Longitude

5

Direction of longitude:

E: East

W: West

6

GPS Quality indicator:

0: Fix not valid

1: GPS fix

2: Differential GPS fix

4: Real Time Kinematic, fixed integers

5: Real Time Kinematic, float integers

7

Number of SVs in use, range from 00 through 12

8

HDOP

9

Orthometric height (MSL reference)

10

M:  unit of measure for orthometric height is meters

11

Geoid separation

12

M: geoid separation is measured in meters

13

Age of differential GPS data record, Type 1 or Type 9. Null field when DGPS is 
not used.

14

Reference station ID, ranging from 0000 through 1023. A null field when any 
reference station ID is selected and no corrections are received.

15

The checksum data, always begins with *