I'd like one of these for snorkeling. The experience depends a lot on weather conditions and micro-geographical factors. 1) underwater visibility around land m

I'd like one of these for snorkeling. The experience depends a lot on weather conditions and micro-geographical factors. 1) underwater visibility around land masses is dependant on precipitation and swell conditions over the previous few days - i.e. the water will be murky if it's been pissing down and blowing a gale for the last 2 days. This is not so much a factor around offshore islands in deep water with strong currents. 2) In hilly areas, it's best to go out when there is an offshore wind, as the land mass shields the water from the wind, making the surface smoother. 3) people have preferences as to the direction and tide (incoming/outgoing/time after low/high tide). 4) It's great when the sun is out, and if you are spearfishing then you want the sun at your back so the fish can't see you. In short there are a a lot of factors that, in some magical snorkeling forecast system, could all be rolled up into a score out of 10 for a specific geographical spot at a specific time.