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64 * 512 = 32768

64 * 511 = 32704

64 * 510 = 32640

So that's just a bunch of zeros for the lower bits.

Interesting. Thanks for the explanation.

Yep. Picked 32640 because the last two values are, from my understanding, inconsistently handled by transmitters due to how far from norm they are.

Too many zeros or too many ones in a row can cause problems with DC balance on the transmitter and the receiver stages.

It's a bit like how the petrol gauge on your car is out to lunch below about 1/8th of a tank.

If you're doing 32000ft/min you're clearly going *muuuuch* too fast, either up or down, implausibly so.

Unless you're in a jet fighter aircraft in which case showing up correctly on flightradar24 is not your biggest worry.