Here's another way to keep your head into skiing through the winter. Install a 37.5 foot width guide in your boat.
This idea was borrowed from the OffCourse official method of calibrating OffCourse.
This is one of my ski partners skiing behind my boat at 35off 34mph. The blue floaty stick is permanently mounted in my boat so you have some idea of your width when Free Skiing when your course isn't available. The floaty stick is permanently installed for 35off because that's my starting length when free skiing. Needed something that would bend over because the rope gets dragged over this spot every time the skier pulls out to stop at the end of a pass. For flexibility, the floaty slips over a 1" PVC pipe that is fastened to the boat's side pocket near the floor.
Needed the height of the floaty stick so it's high enough to show in the video like below. Tape on the deck works too, but it doesn't show in your videos if you prefer a normal focal length view of the skier.
If you are free skiing at 35 off, you can glance at the boat to see if the blue marker is in line with the pylon. If not you're skiing too narrow. The camera is pylon mounted so in this photo the camera, the blue floaty and the real ball are exactly in line. I used a trig calculator to locate the blue floaty, so I didn't need the boat in a big yard to lay it out as suggested by the OffCourse manual.