Sentence:  Presumably, this means that one may ooch only to initiate surfing or planing and that, if challenged, one must be prepared to defend one's ooching behavior in light of the conditions and the wave pattern. Potential problems: How many <WSD>ooches</WSD> are permitted per wave? 
Meaning of the word marked with <WSD> tags:  An act of forcing the boat forward by rocking one's body.