Lomcevak,
Your 300ft estimate looks to be pretty right. Thanks for your trouble.
However, as had been noted earlier in this thread, the distance fixed-wing aircraft are required to keep from whales is 1000ft.
So, not only are we dealing with TCT's subsequent inane embellishments on this particular score (10 or 25ft etc), but the silly girl has
recorded her blatant rule-breaking on a publicly released film.
What were you doing while this was going on, Ewald?
Oh, that's right, you were only a passenger.
.