====== GNSS on 4G Module ======

===== Introduction =====
This page will introduce the usage of the GPS/GNSS capabilities on 4G module (EM06_E). This includes how to enable the GNSS functions and get the raw satellite data from the module, And how to display the Positional data graphically.

===== Enable GNSS =====

Install minicom and open ''/dev/ttyUSB2'' port.
```shell
$ sudo apt-get install minicom
$ sudo minicom -D /dev/ttyUSB2
```
Send the following commands via minicom to enable GNSS.
```shell
AT+QGPS=1
AT+QGPSGNMEA="GGA"
```

===== Get the GPS data =====

Obtain GPS data through ''/dev/ttyUSB1'' port.
```shell
$ sudo minicom -D /dev/ttyUSB1
```

```
Welcome to minicom 2.8

OPTIONS: I18n 
Port /dev/ttyUSB1, 15:30:32

Press CTRL-A Z for help on special keys

$GPVTG,,T,,M,,N,,K,N*2C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGGA,,,,,,0,,,,,,,,*66
$GPRMC,,V,,,,,,,,,,N*53
$GPVTG,,T,,M,,N,,K,N*2C
```

===== Get GPS data using gpsd =====
==== Install gpsd ====
Before you begin, install gpsd and the client programs by running the following command.
```shell
$ sudo apt install gpsd gpsd-clients
```
==== Configure gpsd ====

Open the gpsd configuration file.
```shell
$ sudo vim /etc/default/gpsd
```

Make the necessary changes to specify the correct device node.
```diff
 Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
+ DEVICES="/dev/ttyUSB1"

# Other options you want to pass to gpsd
+ GPSD_OPTIONS=""

# Automatically hot add/remove USB GPS devices via gpsdctl
+ USBAUTO="true"
```

Restart the services.
```shell
$ sudo systemctl restart gpsd
```

==== Observe data ====
Start the cgps client to observe data.
```shell
$ cgps
```
Start the gpsmon client to observe data.

```shell
$ gpsmon
```