Use the top right options to select survey region and time period of interest. Click on map legend entries to show/hide layers and double click to place that layer on top.
About 90% of the structures surveyed are swing moorings, but checks are also made of jetties, floating pontoons, artificial rock walls, etc. Seabed areas checked are normally adjacent to, or below, these structures.
Click on legend entries to hide or focus on origins of interest