The eval(v, eqns) command is an extension of the top-level eval command which correctly evaluates free Vectors , rooted Vectors, position Vectors, and VectorFields for the VectorCalculus package.  If v is not a Vector, the arguments are passed to the top level eval command.

If v is a rooted Vector then both the root point or origin and the components, corresponding to the coefficients of the basis vectors, are evaluted.

If v is a VectorField, then the components are evaluated and a VectorField is returned. To properly evalute a VectorField at a point use evalVF.

If v is a free Vector or a position Vector, then the components are evaluated. The type of the Vector does not change.