“Too close” is totally subjective. There is no specific measurement to abide by, though I often wish there was. What there is, however, is an unspoken gauge. Whether recreationally fishing or tournament fishing, I have found too close can be determined by the overall vibe of either or both parties. You don't have to read people's mind. If you think you’re too close, you probably are. If the silence is deafening when you near another boat, or you’re getting the death stare, take the hint. If you insist on sticking around, the best thing you can do is just say, “hey, am I in your way here?” If you’re the one being encroached upon, suggest that you’d like some room in a nice way. That’s not to say either scenario won’t end in a shouting match, but a little calm communication is a good way to start.