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always have a good primary and secondary light. but i would invest in a good surface signal device. my advance course had it a mandatory requirement along with a signal mirror and whistle. ( most of the courses were out in open gulf water) i have the standard small sauage but after reading an articile about "size "does matter i went with the extra large dan sausage which had the whistle and mirror and glow stick stowed in a pocket. this freed up some space on the bcd because i have it clip to a back d ring. also if you do alot of open water a dye marker would be good and a small mesh pocket to put things even a small packet of sunscreen .
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