Navigation couldn’t be simpler. If the water is deep blue, and most of it is, you’re good to go. If it’s shimmering lighter shade of blue, or a brownish yellow, pick a different direction and avoid the reef. It’s about that simple. Vava’u’s only navigation buoys are all in the harbor at Neiafu, and there are only three of them, all within about 50 yards of each other. After that, well you’re on you own.