MarineTrafic

• Location-sharing app uses phone signal to find AIS information in your area and lets you know where other boats are and gives extra information such as boat speed and destination so you can get an idea of their possible heading. (AIS stands for Automatic Identification System - a system used to supplement radar information for collision avoidance)
• Obviously not all boats have AIS, so it really is only a guide, but can help defining potential collision courses, e.g. during low visibility situation.
• Get more info and download it here: