Drone idea

[cliff]

The phantom does not look quite as advanced as it does not include the Follow Me technology and automatic hover when the controls are left. With the 3D Robotics Iris+ you can set it to follow you sailing, either from a set position or to circle the yacht to get alround video - with no more user input.

The big worry will all drones is they cannot take automatic avoiding action against objects like trees and masts.

Read carefully - all the functions you mentioned are available. 3D Robotics (or DJI for that matter) are not the "bees knees" as tis technology is changing practically on a daily basis - what is good today is obsolete tomorrow.