This is a great app to use on a sailboat to complement the AIS information on the chart plotter. This shows all the boats out of range of the Class B transponder. My first request is for some commentary on the types of craft that are large and are "hiding" from AIS. Some military ships appear on Marine Traffic, and some do not. My second suggestion is that you provide an overlay concerning the level of risk of piracy (actual or perceived) in Africa and Asia. On a business trip to Djibouti I saw a lot of ships near the port, which did not appear on Marine Traffic. In a few cases this makes no sense at all - for example the cargo ship is carrying cars and light freight and is visible from far away due to the high deck. However in other cases there is a good reason why boats in Djibouti avoid AIS.