A tent set up on the beach should be sufficient proof someone is using that spot, I realize there should be time limits but one day, like one boat leaving this morning and another arriving the next morning.How do you know if the tent is empty. Jump on the beach and unzip the tent?
When our houseboat was out of commission I did some solo boat camping trips. I would bring a small tent, not for sleeping but a place to store my stuff while fishing. I would sleep in the boat and place everything in the small tent before heading out at first light. Generator, fuel cans, my camp chair, everything. If you came by my camp all you would see is a small 'empty' tent. Im not going to jump on the beach and inspect somebody's tent.
What is really bad is for another boat to pull in close enough to step over your anchor lines to tie up their boat, that's when things can get heated.
