S o n o m a U s e r M a n u a l
102
C H A P T E R T E N
103
S o n o m a U s e r M a n u a l
O P T I O N S
Field 3
3827.030
Latitude in ddmm.mmm
Field 4
N
Direction of latitude (N=north, S=south)
Field 5
12244.020
Longitude in dddmm.mmm
Field 6
W
Direction of longitude (W=west, E=east)
Field 7
0.08
Speed over ground, knots
Field 8
158.14
Course made good, degrees True
Field 9
200508
Date of fix (ddmmyy)
Field 10 empty field
Magnetic variation
Field 11 empty field
Direction of magnetic variation
Field 12 A
A=autonomous mode, N=data not valid
Checksum *0D
Msg End <CR><LF>
VTG (Course Over Ground and Ground Speed)
The VTG sentence identifies the actual course and speed relative to the ground. Course over ground
degrees Magnetic is not available. Examples are below:
$GPVTG,,T,,,,N,,K,N*61<CR><LF>
$GPVTG,158.14,T,,,0.08,N,0.14,K,A*74<CR><LF>
Msg ID
$GPVTG
Field 1
158.14
Course over ground
Field 2
T
Fixed text “T” shows degree True
Field 3
empty field
Course over ground (not available)
Field 4
empty field
Degrees Magnetic (not available)
Field 5
0.08
Speed over ground, knots
Field 6
N
Fixed text “N” shows speed over ground is in knots
Field 7
0.14
Speed over ground, km/hr
Field 8
K
Fixed text “K” shows speed over ground is in km/hr
Field 9
A
A=autonomous mode, N=data not valid
Checksum *74
Msg End <CR><LF>
ZDA (Time and Date)
The ZDA sentence identifies the time associated with the current 1PPS pulse. Each sentence is
transmitted within 500 milliseconds after the 1PPS pulse is output and tells the time of the pulse that
just occurred. If the Sonoma is unsynchronized then this sentence will be composed of null fields.
Examples are below:
$GPZDA,,,,,,*48<CR><LF>
$GPZDA,175658.00,20,05,2008,07,00*69<CR><LF>
Msg ID
$GPZDA
Field 1
175658.00
UTC time at 1PPS (hhmmss.ss)
Field 2
20
Day (01 to 31)
Field 3
05
Month (01 to 12)
Field 4
2008
Year (1980 to 2079)
Summary of Contents for Sonoma N12
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