Each node in the “Tree” has an icon that shows you what each node is. This allows you to see at a glance the structure of your project and how each item is related to the cave as a whole. There are also special icons that show you if a data file has links or fixed stations associated with it. Links and fixed stations can only be used with Project Files, so these special icons only appear in Project Files. Also, links and fixed stations can only be associated with Survey Data File nodes, so only these nodes will have the special icons. Here is diagram that show each icon and its meaning:
