Export a Complex planar curve

Hi! I have a curve that can be contained in a plain but the plain is inclined in more than one degree of freedom. I want to export the curve to autoCAD but when i do, the measures changes. I have the idea of make a viewport to see the “plane” which contains the curve and try to export from it, but i don`t know how to situate the camera to focus the plane with the curve with exactitude.
Any ideas?

Create a construction plane from three points on the curve, then use View Construction Plane Top