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Copernicus GPS Receiver     2 2 1

NMEA 0183     C

The GLL message contains the latitude and longitude of the present vessel position, 
the time of the position fix and the status.

$GPGLL,llll.lllll,a,yyyyy.yyyyy,a,hhmmss.ss,A,i*hh<CR>

<LF>

The GSA messages indicates the GPS receiver's operating mode and lists the 
satellites used for navigation and the DOP values of the position solution.

$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,

xx,x.x,x.x,x.x*hh<CR><LF>

Table C.6

GLL - Geographic Position - Latitude / Longitude Message Parameters

Field

Description

1,2

Latitude, N (North) or S (South)

3,4

Longitude, E (East) or W (West)

5

UTC of position (when UTC offset has been decoded by the 
receiver)

6

Status: A = Valid, V= Invalid

7

Mode Indicator

A=Autonomous Mode
D=Differential Mode
E=Estimated (dead reckoning) Mode
M=Manual Input Mode
S=Simulated Mode
N-Data Not Valid

hh

Checksum

Table C.7

GSA - GPS DOP and Active Satellites Message Parameters

Field #

Description

1

Mode: M = Manual, A = Automatic. In manual mode, the receiver 
is forced to operate in either 2D or 3D mode. In automatic mode, 
the receiver is allowed to switch between 2D and 3D modes 
subject to the PDOP and satellite masks.

2

Current Mode: 1 = fix not available, 2 = 2D, 3 = 3D

3 to 14

PRN numbers of the satellites used in the position solution. When 
less than 12 satellites are used, the unused fields are null

15

Position dilution of precision (PDOP)

16

Horizontal dilution of precision (HDOP)

17

Vertical dilution of precision (VDOP)

hh

Checksum