My winter project is a DIY tarp. I'm following the DIY Supply plan for a 11'Lx10' wide tarp which calls for the seam to run lenthwise. I intend to use a ridgeline with the tarp so I can move the tarp lengthwise along ridgeline to center it over the hammock.

I just got my fabric in the mail. I had expected 60" bolt but to my surprise my cut is 66" wide. My question is, is running the seam perpendicular to the long dimension not recommended? Running the seam this direction would be more efficient with the material I have.