Thanks to OCEARCH, it's easy to know if there might be a shark under your boat! The non-profit organization has launched a website that shows you where their tagged sharks have been. Every time the dorsal fin of one of the sharks breaks the surface of the water, a signal is sent to a satellite. This signal then sends OCEARCH an estimated geolocation, which is then mapped on their website. Luckily there have been no recent signals coming from the bay, but a 14 foot Great White named Genie was at Cape Cod on May 25.