Put some peace-of-mind on your boat with the BlackLine Harpoon GPS. Touted as the boating industry’s first GPS-based active recovery solution, you’ll be able to follow your boat no matter where it goes – even if you’re not on it! By utilizing the BlackLine Recovery Service, this GPS device works with the authorities to track your boat down in real time. The Harpoon also allows you to share your location with friends and family, so they can follow you along on your boating adventure. It can also be used in conjunction with a mobile phone as a remote control and send locations through text message (SMS). The Harpoon sells for $349.99. BlackLine.