Based on Survey Notes I may only know the Delta angle and the tangent length of a curve that I need to comp for example. I can graphically comp the two tangent lines to get may Delta angle, but I need a curve calculator to know what the radius needs to be. I may only know a few perimeters of the curve and radius is not one of them.

Could you add what specific features or problems you're looking to solve with this request? It would help us understand the need a little better.