In the MP when “climb to ALT_HOLD_RTL before turning for RTL” is selected, the corresponding value is 16, but the document says 4.
Document:
I think the document need to be updated.
It’s a bitmask. Bit 4 set (with no other bits set) results in a decimal value of 16.
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There’s 10 types of people in this world: those that undertsand binary and those that dont 
Bitmasks are used extensively.
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Perhaps this animation can help explain my level of comprehension in machine language.
And that’s why Mission Planner gives you a window with clicky check marks.
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