Wherever the slit in his eyes is pointed, that's where he's looking. They have very good vision, and they can see almost 180 degrees. They can't see anything below their nose, but anything above the water is in their sight range. In the water, we look for any disturbances or small bubbles that might clue us in to movement. In shallow, clear water they are easier to detect, but people have had some close calls in clear, shallow water at night.
Night time is their time.
During the day we take people over to see the crocodiles, and they pay no attention to us at all. At night, no one goes over there. They really enjoy each other's company, and their social structure is very important to them. The females will chase each other around, sometimes, for fun. During mating season the males look after their girls, and that's their time, the night.