[aprssig] APRS LAT/LONG standards

[Keith Kotch]

Would someone please take the time to publish the math formulas for
converting lat/lon coordinates to and from different formats?  Please give
examples for each conversion starting with a DD/MM/SS coordinate and use the
same coordinate throughout the examples.

DD/MM/SS to DD.MM.mmmm 
DD/MM/SS to DD.dddd
And so on...

In other words, please show me the math or point me in the right direction. 

Thanks,

Keith, KF4BXT