It depends on preference, length of cord, distance between ridge supports (trees?), and the strength of the tarp's tie-outs. smile

I prefer using the tie-outs due to more flexibility in anchor points with less cord and not having to worry about water seepage along the cord. (I do still have to worry about water seepage into my hammock from the support straps though. whistle)
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Bushcraft Science: It's not about surviving in the wilderness, it's about thriving in the wilderness.