Vtg-Course Over Ground And Ground Speed; Gps Receiver User's Tip - Professor REB-3000 Series Operational Manual

Professor RGM-3000/REB-3000
GPS Module Operational Manual)
Table 6 RMC Data Format
Name
Message ID
UTC Position
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Course Over Ground
Date
Magnetic Variation
Checksum
CR LF
VTG-Course Over Ground and
Ground Speed
Table 7 contains the values of the following
Table 7 VTG Data Format
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Checksum
CR LF
.

GPS Receiver User's Tip

1. GPS signal will be affected by weather and environment conditions, thus suggest to use the GPS
receiver under less shielding environments to ensure GPS receiver has better receiving performance.
2. When GPS receiver is moving, it will prolong the time to fix the position, so suggest to wait for the
satellite signals to be locked at a fixed point when first power-on the GPS receiver to ensure to lock
the GPS signal at the shortest time.
3. The following situation will affect the GPS receiving performance:
a. Solar control filmed windows.
b. Metal shielded, such as umbrella, or in vehicle.
c. Among high buildings.
d. Under bridges or tunnels.
e. Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
f. Bad or heavy cloudy weather.
4. If the satellite signals can not be locked or encounter receiving problem (while in the urban area), the
following steps are suggested:
a. Please plug the external active antenna into GPS receiver and put the antenna on outdoor or the
roof of the vehicle for better receiving performance.
b. Move to another open space or reposition GPS receiver toward the direction with less blockage.
c. Move the GPS receiver away from the interferences resources.
d. Wait until the weather condition is improved.
Example Units
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13 knots
309.62 degrees
120598
degrees
*10
Example Units
$GPVTG
309.62 degrees
T
degrees
M
0.13 knots
N
0.2 km/hr
K
*6E
20
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
True
ddmmyy
E=east or W=west
End of message termination
example:$GPVTG, 309.62, T, , M, 0.13, N,
0.2, K*6E
Description
VTG protocol header
Measured heading
True
Measured heading
Magnetic
Measured horizontal speed
Knots
Measured horizontal speed
Kilometer per hour
End of message termination