If you visit Olib Island by a boat, you can either moor at the pier where you can get electricity and water, but you must choose the North side, because regular line docks on the other side of the main pier, or you can tie your boat to a buoy.
There are about 20 of them and the price is around 13 Croatian Kuna per meter.
There are some fun facts about the buoy and it concrete block on the seabed: the block weighs 800 kg, and its dimensions are 1.2 x 1.2 x 0.5 m. the rope is polyamide 20 mm thick, and the buoy itself is plastic (PVC) with 60 cm radius. It all says on the back side of the receipt along with the "How to Tie Your Boat to the Buoy" manual. If you didn’t know, you must tie one rope to the lower ring and one to the top ring on the buoy.
Though it should be protected from NE winds, we had a pretty rough night because Olib is very low and bora wind gets over it easily.
Oh, check out the last photo – quad with balls