Thanks to Aussie Outfitter and hammock maker Tier Gear for allowing me to repost DIY instructions for this excellent tarp. You can still find their original post here: Tier Gear Catenary Cut Hex Tarp.

A cat cut is actually a shortened term that refers to a catenary curve. Catenary curves have been of interest to mathematicians for about as long as math has been around. There are many complex equations to calculate how a catenary curve will fall. I am going to strip away all the math and go back to the basic definition of a catenary curve.