https://www.waveshare.com/product/pico-can-b.htm
https://www.waveshare.com/wiki/Pico-CAN-B
https://ww1.microchip.com/downloads/en/DeviceDoc/MCP2515-Stand-Alone-CAN-Controller-with-SPI-20001801J.pdf
https://files.waveshare.com/upload/1/13/PICO-CAN-B-sch.pdf
CAN V2.0B at 1 Mb/s
16 MHz crystal.
NMEA is 250kb/s.