[time-nuts] OT - GPS and North

Iain Young iain at g7iii.net
Sat Nov 21 23:10:13 UTC 2009


Gary Chatters wrote:

> I have no idea of how the math works for computing heading.

Checkout FORWARD and INVERSE (and their 3d equivalents) at
http://www.ngs.noaa.gov/TOOLS/Inv_Fwd/Inv_Fwd.html

While these are hosted on a NOAA site, I'm sure I've seen
it on a NASA site as well. IIRC, there is also a C port
somewhere.


Iain








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