The Smartfin is a surfboard fin with sensors that measure multiple ocean parameters including salinity, temperature, location, wave characteristics, and pH (in development). The data surfers acquire while in the water will become accessible in near real-time to the world-wide scientific community. But Smartfin is not only about the data. It is also an effort to connect surfers and their communities to larger issues affecting ocean health. Using the data collected with Smartfin, we can better understand trends in ocean warming and acidification and mobilize our communities to take action to combat these problems caused by climate change.