iSXblue/SXBlue II GNSS Series Technical Reference Manual
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5.9.7
RMC Data Message
The RMC message contains recommended minimum specific GPS data. The table below breaks down the
RMC data message into its components. This message has the following format:
$GPRMC,hhmmss.ss,a,ddmm.mmm,n,dddmm.mmm,w,z.z,y.y,ddmmyy,d.d,v *cc<CR><LF>
Table 5-18 RMC Data Message Defined
Field
Description
hhmmss.ss
UTC time in hours, minutes, seconds of the GPS position
a
Status is valid if a = A, status is invalid if a = V
ddmm.mmmmm
Latitude in degrees, minutes, and decimal minutes
n
S = N or s = S, for North or South latitude
dddmm.mmmmm
Longitude in degrees, minutes, and decimal minutes
w
S = E or s = W, for East or West longitude
z.z
Ground speed in knots
y.y
Track made good, referenced to true north
ddmmyy
UTC date of position fix in day, month, year
d.d
Magnetic Variation in degrees
v
Variation sense v = E = East, v = W = West
*cc
Checksum
<CR><LF>
Carriage return and line feed
5.9.8
RRE Data Message
The RRE message contains the satellite range residuals and estimated position error. The table below
breaks down the RRE data message into its components. This message has the following format:
$GPRRE,n,ii,rr…ii,rr,hhh.h,vvv.v *cc<CR><LF>
Table 5-19 RRE Data Message Defined
Field
Description
n
Number of satellites used in position computation
ii
Satellite number
rr
Range residual in meters
hhh.h
Horizontal position error estimate in meters
vvv.v
Vertical position error estimate in meters
*cc
Checksum
<CR><LF>
Carriage return and line feed
