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Format of the NMEA 0183 String (RMC)

The NMEA String is a sequence of 65 ASCII characters starting with the ‘$’ character

and ending with the characters CR (carriage return) and LF (line-feed). The format is:

$GPRMC,hhmmss.ss,A,bbbb.bb,n,lllll.ll,e,0.0,0.0,ddmmyy,0.0,a*hh<CR><LF>

The letters printed in italics are replaced by ASCII numbers or letters whereas the

other characters are part of the time string. The groups of characters as defined below:

$ start character (ASCII-Code 24h)

hhmmss.ss the current time:

hh hours (00..23)

mm minutes (00..59)

ss seconds (00..59, or 60 while leap second)

ss fractions of seconds (1/10 ; 1/100)

A Status (A = time data valid)

(V = time data not valid)

bbbb.bb latitude of receiver position in degrees

leading signs are replaced by a space character (20h)

n latitude, the following characters are possible:

‘N’ north of equator

‘S’ south d. equator

lllll.ll longitude of receiver position in degrees

leading signs are replaced by a space character (20h)

e longitude, the following characters are possible:

‘E’ east of Greenwich

‘W’ west of Greenwich

ddmmyy the current date:

dd day of month (01..31)

mm month (01..12)

yy year of the century (00..99)

a magnetic variation

hh checksum (EXOR over all characters except ‘$’ and ‘*’)

<CR> carriage-return; ASCII-Code 0Dh

<LF> line-feed; ASCII-Code 0Ah

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Meinberg GPS167LCD-MP Manual do Utilizador Página 40