ABQ:Azza,
Looks to me that you've violated the TOS - I will not talk to you further. Gook luck with your diving.
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sinkorswim,
NOAA has specific use guidelines for snorkel use, along with all equipment - as you seem to know. The NOAA Skills Evaluation Dives that I did required snorkel tests proficiency.
http://www.ndc.noaa.gov/pdfs/ChckoutRpt.pdf
All diving that I did/do for NOAA always fell outside rec profiles; have you ever seen the paperwork? Are you NOAA?
ABQ,
I'd like to hear the official stance on a snorkel. We've been given scenarios by several people on this thread, hypothetical or otherwise, but I haven't heard anything on what purpose the agencies think a snorkel serves in scuba.