Sendero_Man,
Yes, it reffers to uphill/downhill angle you're shooting at.
I'm using the latest version of Exbal Pocket PC, version 6.0. For the incline angel section, you can choose between (deg) for degrees, like 10,20 or 30, and (cosine) referring the the cosine of the angle. Cosine(10)=0.98, Cosine(20)= 0.94 or Cosine(30)=0.87. Depending of what type of cosine indicator your have.

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HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.