148
VEL: Velocity
$PASHR,VEL,f1,m2,f3,f4,f5,f6,f7,f8,d9*cc
VTG: Course Over Ground and Ground Speed
$GPVTG,f1,T,f2,M,f3,N,f4,K,c5*cc
ZDA: Date & Time
$GPZDA,ZDA,m1,d2,d3,d4,d5,d6*cc
Parameter
Description
Range
f1
Reserved
1
m2
Current UTC time of velocity fix (hhmmss.ss)
f3
Easting velocity, in m/s
f4
Northing velocity, in m/s
f5
Vertical velocity, in m/s
f6
Easting velocity RMS error, in mm/s
f7
Northing velocity RMS error, in mm/s
f8
Vertical velocity RMS error, in mm/s
d9
Applied effective velocity smoothing interval,
in ms (empty if unknown)
*cc
Checksum
*00-*FF
Parameter
Description
Range
f1,T
COG (with respect to True North)
T for “True” North: COG orientation
000.00-359.99
f2,M
COG (with respect to Magnetic North)
M for “Magnetic” North: COG orientation
000.00-359.99
f3,N
SOG (Speed Over Ground)
N for “knots”: SOG unit
000.00-999.999
f4,K
SOG (Speed Over Ground)
K for “km/hr”: SOG unit
000.00-999-999
c5
Mode indicator:
• A: Autonomous mode
• D: Differential mode
• N: Data not valid
A, D, N
*cc
Checksum
*00-*FF
Parameter
Description
Range
m1
UTC time (hhmmss.ss)
000000.00-
235959.99
d2
Current day
01-31
d3
Current month
01-12
d4
Current year
0000-9999
d5
Local zone offset from UTC time (hour)
-13 to +13
d6
Local zone offset from UTC time (minutes)
00-59
*cc
Checksum
*00-*FF
