We were lucky enough to find a nest quite low down a couple of years ago. The parents were feeding young and, as it was by a well-used path, they were fairly used to people so, although they were wary, we kept our distance and got some good shots. Good luck!
I am really not that familiar with them at all, I rarely see them, but you seem to be really lucky to have seen a nest.
I used to have a cabin on a lake years ago, I saw these ALL of the time, they drove me crazy with their weird sounding voice, I hated them for waking me up while I was in my hammock.
Now, I can't believe I am the same person, of course I didn't shoot birds.