4.4 Format of the NMEA 0183 String (RMC)
The NMEA String is a sequence of 65 ASCII characters starting with the ‘$GPRMC’ 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 where as the
other characters are part of the time string. The groups of characters as defined below:
$
Start character, ASCII Code 24h
sending with one bit accuracy at change of second
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
18
Date: 24th July 2018
DCF600HS
