Come on, Peter. Even I could hit Ireland starting in Newfoundland (weather permitting of course)
When Chichester left Cape Reinga, he was aiming at a 3 mile-wide dot 400 nm away. That's about 1/2 degree wide. If he missed it, he would have ditched and probably died.
And having done that, he did it again, finding Lord Howe Island 480 nm away.