Here's a new rabbit hole to go down that could be rather interesting.
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I used to do HF APRS with a MFSK16 tracker I designed and built. It worked surprisingly well, but HF mobile operators are scarce.
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Fast forward 15 years and they are doing it much better with VARA.
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Stephan Smith WA8LMF is the stateside "guru" tho I will warn you, he's abrasive and doesn't suffer fools. He's an engineer in the mold of Sheldon at times.
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I'm think about trying the Pinpoint version with my VARA HF station.
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73
Mike N0QBH
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N0QBH Mike Berg