I also was a little doubtful the single template would help, but there are three depth measurements listed for the distance from the first pylon, the center, and the rear pylon. The template fit the hull shape exactly in the center and will provide a pretty good go-by for the keel shape from pylon to pylon if used with the depth measurements provided. Unless there has been some serious hull damage, the single template should keep you class legal after reshaping normal keel wear.
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<br>I think this template was copied from the hull repair kit sold by Murrays. A Hobie dealer might be able to provide more information.<br><br>