[MLB-WIRELESS] OT: bearing/coordinates math

[Julian Featherston]

Hi all

Took forever to understand how the "does it from Lat and Long" equation
spits out a clockwise rotation from north when the last operation is
arctan - but if u think of the globe from the inside arctan will give
just that.
All u need then is to resolve which of the possible answers is correct
with a couple of "if then" operations.
I'm trying to work out the simplest if thens
Would u calculate bearings to all other nodes when a node is added, and
store values?
I have a simple method (involving only one arctan and a few add, sub,
and if then) that is fine for dist less than ~160km 
I prefer the accurate method, but have little idea how much it would
slow things down.
Love these mind benders :)

Jules
 




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