Tells me that it wants the units to be in degrees? So then, what is
the 0.0174xx number there? Once again, I can only speculate, but I
am assuming that perhaps this is a conversion to meters or some
other standard unit at some point on the map (perhaps at the prime
meridian).
It's the conversion factor to get from degrees to radians, i.e. Pi/180;
angle_rad = angle_deg * 0.01745329251994328.
(actually it should be 0.01745329251994330 ...)
Hope this helps.
Sidney
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