Veripos LD6 Operation Manual page 81

Procedure Title: LD6 Operations Manual (B Variant)
File Ref.: AB-V-MA-00589
NMEA GLL Sentence
The NMEA GLL 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
dddmm.mmmmmmm longitude of position
b
hhmmss.ss
S
I mode indicator (A = Autonomous, D = Differential, E = Estimated, M = Manual, S =
Simulator, N = data Not valid)
*cc<CR><LF>
NMEA VTG Sentence
The NMEA VTG sentence provides the actual course and speed relative to the ground.
Structure and Example:
$GPVTG,p.p,T,q.q,M,r.r,N,s.s,K,u*hh<CR><LF>
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*33
VTG sentence defined:
VTG = Course over ground and ground speed
p.p
T
q.q
M
r.r
N
s.s
K
U
*hh<CR><LF> checksum, carriage return and line feed
Note that, as of the 2.3 release of NMEA, there is a new field in the VTG sentence at the
end just prior to the checksum. Receivers that don't have a magnetic deviation (variation)
table built in will null out the Magnetic track made good.
Rev No: A4
N or S
E or W
UTC of position
status (A = data valid ; V = data not valid)
checksum, carriage return and line feed
course over ground
degrees True
course over ground
degrees Magnetic
speed over ground
knots
speed over ground
km/hr
mode indicator (A = Autonomous, D = Differential, E = Estimated)
Page 81