I am new to this birding stuff so please excuse my ignorance. When entering a hide in which somebody is already established, what is proper etiquette? Do I ignore them (as I was ignored yesterday by a man with very posh green bins and scope and a flask of tea) or do I politely nod and half-smile to acknowledge their presence (as is my inclination). I am reluctant to speak and try to make as little disturbance as possible but don't want to create any "atmosphere".