Follow me is essentially a dynamic home point. It will keep following you using GPS reception and then just land using the sticks or setting a new homepoint but as long as you have reception, you can always switch on Follow Me and call it a dynamic movement that follows you, it just won't land but you can do that. It's not like you're gonna let it land itself in a boat anyway.
It's not dynamic but you can reset it in the MC settings from the boat essentially getting the same thing. They moved it from the main screen to the MC settings. It's right above the "Multiple Modes" button. Stupid place and I wish they would put it back on the main screen. In fact, I wish they would make it a programmable button.
Also, and I really have to check this but I think once the bird is on the way down, it becomes dynamic but that's not really what you're after I know and I am not 100% sure either.
I have noticed this recently by accident.
I was flying in a huge field which I don't normally do and I love to film my landing in ATTI mode so I was using this occasion to test the RTH over and over and I could have sworn that once it was on its descent, if I walked away, the bird was following me. I noticed it on my last bat and only had one more chance to test it and that was only a few days ago. Haven't tested since.
Either way, you should always in my opinion for safety (of the bird) reasons always be using a GPS/Glonass enabled receiver (ALL IPADS that are not cellular ARE NOT GPS enabled).
With GPS enabled, you can also turn on the follow me mode once you have completed whatever it is you are shooting.
There ya have it. Dynamic homeport through follow me.
If that doesn't make sense, I blame the clock.