ICR-1601
79
2.4
GNSS
The configuration steps include following items.
Activate GNSS feature in gateway and finish settings of cellular WAN.
Support NMEA 0183 (compatible to 3.0) protocol, and allow customized prefix and suffix.
Configurable GPS data logging on local microSD card storage for route record tracking.
Indicate remote host, time interval, TCP/UDP, and type of GPS data that would be sent.
Please note the available GNSS features on different models may be different. Please check product
datasheet for details.
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 case, this configuration depends on which data format that
your central server can recognize. 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.
GPS Message Type
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
Please note this option is hardware dependent. The available options of GPS message type show on
this page is according to product specification. You may not see all options if your product doesn’t support
all of them.
Assisted GPS
Assisted GPS (as known as A-GPS) is used for speeding up location fix, especially when satellite signal
is weak. If activating this option, gateway will download almanac data from A-GPS server through IP
network instead of from satellite. You can also choose different valid period of almanac data. The shorter
almanac data will get higher accuracy. However, the almanac data with shorter valid period needs to be
updated more frequently. It will consume more network bandwidth. Please note this option is hardware
dependent. You may not see this option if your product doesn’t support it.