[James]’ DIY chart plotter overlays the received AIS data over marine charts on a nice big display. A Raspberry Pi 3B+, AIS Receiver Hat, USB GPS dongle and a makes up the core of the system.

For those unfamiliar with the toy, it’s basically a manual X-Y plotter that drags a stylus ... [Sunny] hooked his up to a Raspberry Pi and wrote some Python code to drive them.