User Manual

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9
Status
A
A=data valid or V=data not
valid
Latitude
3723.24756
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude
12158.34162
ddmm.mmmm
E/W Indicator
W
E=east or W=west
Speed Over Ground
0.13
knots
Course Over Ground
309.62
degrees
Ture
Date
120598
dBHz
ddmmyy
Magnetic Varation
E=east or W=west
Checksum
*10
＜CR＞＜LF＞
End of message termination
3.1.6 VTG-Course Over Ground and Ground Speed
Table 7 contains the values of the following example:
$GPVTG, 309.62, T, , M, 0.13, N, 0.2, K*6E
Table 7 VTG Data Format
Name
Example
Units
Description
Message ID
$GPVTG
VTG protocol header
Course
309.62
degrees
Measured heading
Reference
T
Ture
Course
degrees
Measured heading
Reference
M
Magnetic
Speed
0.13
knots
Measured horizontal speed
Units
N
knots
Speed
0.2
Km/hr
Measured horizontal speed
Units
K
Kilometer per hour
Checksum
*6E
＜CR＞＜LF＞
End of message termination
4 Hardware Interface
The GP-20U7 includes an antenna in a unique style waterproof gadget. We can