Unit for Knots is "kn"
Correct minimum value for speed is 0
Removed special handling of d>x function. I believe it is not needed. Please check.
This was lost somehow
Compile errors
Converted speed from knots to mph
Merge commit 'c9cc39c1395db32ffd4ef816f3cecbe8e5a2af96' into next
Merge commit '2a277e930cb8e598c46aa24a5bf29056420cad6a' into next
Merge commit '7c12a24c09923ee473f6e9d01c58f3cf49acc903' into next