public bool ConvergenceAtPoint(const ProjectedPoint
&point, AngularValue &convergence) const
Description
The ConvergenceAtPoint method calculates the convergence angle at the specified point. The convergence angle is the difference between grid north and true north. The method takes two arguments, the first of which is the ProjectedPoint at which the convergence should be calculated, and the second of which is an AngularValue that will hold the resulting convergence value. The method returns a boolean value indicating the success of the operation.