PaddyB - Just having a little play here from a ...
Just having a little play here from a post on openplotter forum, what does the Validate Checksum" actually do? Seems anything coming in a nmea1083 connection goes straight back out port 10110 🤔´SigK looks like it ignores anything it can't decode anyway?

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0183 data that is received goes out on 10110 as is, prior to actually parsing the sentences. Checksum checking is part or parsing & convertion to sk
Sk ignores garbled 0183, either because it can not parse it (line starts with spaces) or invalid checksum