I recently discovered this free app. BOAT WATCH
It shows in real time the position of Ships transmitting their AIS data worldwide. From what I can see the ships shown are those using Class A transceivers which means mostly large vessels.
Although I have not had yet been able to try this app out afloat, it would seem to me that it could be most useful when navigating area’s such as the Thames estuary, especially if you subscribe to the upgrade which allows access to full data transmitted and includes
Ships name , MMSI & Photo
Status, speed, course and rate of turn
It would be interesting to hear from anyone who has used BOAT WATCH while sailing.
With the Seasons Greetings,