He knew approximately where the opening was that led to other parts of the cave.

I couldn't see him but I knew approximately where he was.

He had heard nonsense like that before, often enough to know approximately what it was supposed to mean.

Harry thought he knew approximately where the place was.

That is to say, we knew approximately where it was.

"No, but they know approximately where we are, and they're closing in on our general vicinity at speed."

And then he would know approximately how far back in time the captain had been tossed.

He knew approximately where the ship would be by this time, and it ought to have been a thrill.

Maybe they knew approximately where we had gone, but not exactly.

We knew approximately where the prison camps were in the area.