There is a great application that is essential if flying a drone it is called, "Hover" and it can be downloaded for free in the Apple App Store. It shows where there is no fly zones, restricted air space, etc. I use it along with the FAA application for my drown. I use the Phantom 3 Pro, mainly for photography, and it is fantastic. I plan on using it next for fishing. (Google search fishing with a drone). I have seen videos that fisherman have attached their line and bait onto their drone and fly it out over open water until fish are seen on the live video screen, the drone does a 360 and deploys the bait and a fish is caught! Pretty cool.
@RobKnjght - I was thinking about the 4 but there is not much difference for me to justify a newer version.
Here is a link to a video showing tuna fishing from the shoreline
Here is a screen shot from the app "Hover" that shows where the restricted air space and no fly zones are located in Aruba