DS-41SMD-2 June ’06

©2006 RF Solutions Ltd, www.rfsolutions.co.uk

Page 8

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Embedded GPS Module

GPS-41SMDR

GPS-41SMDF

NMEA Messages

The serial interface protocol is based on the National Marine Electronics Association’s NMEA 0183 ASCII

interface specification. This standard is fully define in “NMEA 0183, Version 3.01” The standard may be

obtained from NMEA, www.nmea.org

GGA - GPS FIX DATA

Time, position and position-fix related data (number of satellites in use, HDOP, etc.).

Format:

$GPGGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>,*<13><CR><LF>

Example:

$GPGGA,104549.04,2447.2038,N,12100.4990,E,1,06,01.7,00078.8,M,0016.3,M,,*5C<CR><LF>

Field

Example

Description

1

104549.04 UTC time in hhmmss.ss format, 000000.00 ~ 235959.99

2

2447.2038 Latitude in ddmm.mmmm format

Leading zeros transmitted

3

N

Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South

4

12100.4990 Longitude in dddmm.mmmm format

Leading zeros transmitted

5

E

Longitude hemisphere indicator, 'E' = East, 'W' = West

6

1

Position fix quality indicator

0: position fix unavailable

1: valid position fix, SPS mode

2: valid position fix, differential GPS mode

7

06

Number of satellites in use, 00 ~ 12

8

01.7

Horizontal dilution of precision, 00.0 ~ 99.9

9

00078.8

Antenna height above/below mean sea level, -9999.9 ~ 17999.9

10

0016.3

Geoidal height, -999.9 ~ 9999.9

11

Age of DGPS data since last valid RTCM transmission in xxx format (seconds)

NULL when DGPS not used

12

Differential reference station ID, 0000 ~ 1023

NULL when DGPS not used

13

5C

Checksum

Note:

The checksum field starts with a ‘*’ and consists of 2 characters representing a hex number. The

checksum is the exclusive OR of all characters between ‘$’ and ‘*’.