Mirroring a sketch in 3D

[Anonymous]

I face the following problem: I have a curve I need to mirror with respect to some plane. 

The red line is the place where I want the line to appear. 

I can't draw a sketch to mirror the curve, as the initial curve and the final curve would be in on the planes that are at an unknown (to me) angle.  

[davebYYPCU]

Model half the boat down the centre plane, when done mirror the half boat.

If the sketch is 2d you can mirror sketch articles, but in Fusion it is difficult to draw anything in a 3d sketch, used mostly for projections, and developed sketch articles.

Might help...