Manual Title:
LD7 Operations Manual
Ref.:
AB-V-MA-00555
Rev No:
A9
Page 50
NMEA HDT Sentence.
The NMEA HDT sentence provides heading information derived from the receiver.
Structure and example:
$GPHDT,xxx.xx,T*hh<CR><LF>
where:
$GPHDT
– is the message name stating it is a GPS heading (true) message
xxx.xx
– this is the heading
T
– states the heading is true
*hh
– is the check sum for the message
NMEA GLL Sentence
The NMEA GGL sentence provides 2D position data.
Structure and Example:
$GPGLL,ddmm.mmmmmmm ,a, dddmm.mmmmmmm ,b,hhmmss.ss,S,I*cc<CR><LF>
$GPGLL,5708.7104685,N,00217.1169613,W,062859.00,A,D*72
GLL sentence defined:
GLL = Geographic position - Latitude and Longitude
ddmm.mmmmmmm
latitude of position
a
N or S
dddmm.mmmmmmm
longitude of position
b
E or W
hhmmss.ss
UTC of position
S
status (A = data valid ; V = data not valid)
I
mode indicator (A = Autonomous, D = Differential, E = Estimated, M =
Manual, S = Simulator, N = data Not valid)
*cc<CR><LF>
checksum, carriage return and line feed
