Globalsat ET-314 GPS Engine Board [12/22] Rmc recommended minimum specific gnss data

ET-314AC

High Performance GPS Engine Board

2010/4/1

- 12 -

SNR(C/No) 42 dBHz Range 0 to 99,null when not tracking

Checksum *71

<CR><LF> End of message termination

1. Depending on the number of satellites tracked, multiple messages of GSV data may be

required. In some software versions, the maximum number of satellites reported as visible is

limited to 12, even though more may be visible.

RMC - Recommended Minimum Specific GNSS Data

Note – Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA

message description

Table A-6 contains the values for the following example:

$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10

Table A-6 RMC Data Format

Name Example Units Description

Message ID $GPRMC RMC protocol header

UTC Time 161229.487 hhmmss.sss

Status

A A=data valid or V=data not valid

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

Speed Over Ground 0.13 knots

Course Over Ground 309.62 degrees True

Date 120598 ddmmyy

Magnetic Variation

degrees E=east or W=west

East/West Indicator

E E=east

Mode A A=Autonomous, D=DGPS, E=DR

N=Output Data Not Valid

Checksum *10

<CR><LF> End of message termination

1. A valid status is derived from all the parameters set in the software. This includes the

minimum number of satellites required, any DOP mask setting, presence of DGPS

corrections, etc. If the default or current software setting requires that a factor is met, then if

that factor is not met the solution will be marked as invalid.

2. SiRF Technology Inc. does not support magnetic declination. All “course over ground” data