I built this on a Pi Zero 2 W because of its low energy consumption when it's running continuously on a boat. Navtex is a 1970s radio technique that delivers navigational and meteorological info and has forward error correction built in. For the characters that still slip through, I added a small n-gram model. An LLM wouldn't fit on the Pi.
I also work on an RTTY mode that hasn't got any built-in error correction. Does anyone have ideas for correcting characters dropped during radio transmission?