Indicate remote host, time interval, TCP/UDP, and type of GPS data that would be sent.
GPS Message Type
This item shows all supported types of NMEA 0183 data format. NMEA 0183 data format was defined and maintained by
National Marine Electronics Association (NMEA). Select one or more types that you want to use for transmitting GPS data. In
most cases, this configuration depends on which data format your central server can recognise. Only select the type you
need, otherwise it will consume unnecessary network bandwidth. The table below shows more information for different
types of NMEA 0183 message.
Type Description Example
GGA Fix Information $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
GLL Lat/Lon Data $GPGLL,4916.45,N,12311.12,W,225444,A,*1D
GSA Overall Satellite
Data
$GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39
GSV Detailed
Satellite Data
$GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75
RMC Recommended
Minimum Data
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
VTG Vector Track
and Speed Over
the Ground
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
Table 247 – GPS Message Types
SBAS
SBAS is Satellite-Based Augmentation Systems that is used to improve the accuracy of location data. There are several SBAS
systems for different areas in the world.
SBAS Area Coverage
EGNOS Europe
WAAS North America
GAGAN India
MSAS Japan
Table 248 – Satellite-Based Augmentation Systems (SBAS)
Assisted GPS
Assisted GPS (as known as A-GPS) is used for speeding up location fixing, especially when the satellite signal is weak. If
activating this option, the NTC-400 Series Router will download almanac data from an A-GPS server through the IP network
instead of from the satellite. You can also choose a different valid period of almanac data. Almanac data with a shorter valid
period will result in higher accuracy. However, almanac data with a shorter valid period needs to be updated more
frequently, consuming more network bandwidth.
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