3.3 Older versions of Raspian – Raspberry Pi 3
The Raspberry Pi 3 uses its serial port for the built-in Bluetooth module. Reconfiguring this with older
versions of Raspian can be quite complex and error prone. We strongly recommend using an up-to-date
version of Raspian and follow the steps outline in chapter 3.1 above instead.
If you still want to reconfigure an older version of Raspian, this blog post may help you:
https://thepihut.com/blogs/raspberry-pi-tutorials/raspberry-pi-gps-hat-and-python
After completing the reboot, AIS data is available using the following parameters:
Use this information to configure OpenCPN or other programs. Keep in mind, that only one application
at a time can consume serial data.
You can verify the serial connection with a serial terminal program like for example screen. You may
have to install screen first by running:
sudo apt-get install screen
With screen installed, connect to the dAISy HAT with
screen /dev/ttyAMA0 38400
If the serial port is properly configured, pressing ESC will bring up the configuration and debug menu.
Pressing ESC again will return dAISy into receive mode. Exit screen by pressing CTRL-A, then K and then
Y.
3.4 Configuration in OpenCPN
OpenCPN is a free chart plotter and navigation software. Among many other things, OpenCPN supports
input from AIS receivers to display the position of ships on its charts.
You can learn more about OpenCPN on http://opencpn.org
There are several tutorials on the web on running OpenCPN on a Raspberry Pi. The consensus is, that
you should only attempt this on a Raspberry Pi 3 or 4 with an up-to-date version of Raspian. The official
instructions can be found here:
https://opencpn.org/wiki/dokuwiki/doku.php?id=opencpn:opencpn_user_manual:getting_started:open
cpn_installation:raspberrypi_rpi2
Alternatively, users have reported good results by following this procedure:
http://www.agurney.com/raspberry-pi/pi-chart
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