Hurin's knowledge after his release

[Aiwendil]

Hurin was first released back to his former domain of Hithlum, then the encircling Mountains were he inadvertantly tips of Morgoth to Turgon's general locale, then Brethil [not in the Silm, but in War of the Jewels], and finally Doriath, before ending his life at the sea.

Don't forget the stop at Nargothrond.

I've always been curious as to how much of Turin's life Hurin actually saw. He seems to be quite familiar with much of it - he knew at least vaguely what transpired in Brethil, Nargothrond, and Doriath, or else he wouldn't have gone to those places seeking his cursed restitution/vengeance. But it never seems that Morgoth was literally able to watch Turin or anyone else with some sort of clairvoyance.