As it works now, as I recall, after mapping a planet you get unexplored icons for biological, geological, xenological, and possibly human I assume (crashed ship and etc.), surface anomalies. But once you visit them, and even scan them, they still show as unexplored. Keeping track of where you've been is almost impossible w/o taking notes, especially with the huge numbers of some anomalies. If the icon would change in any way it would be helpful, just a solid square would do. But having several varieties would be a nice touch, at least for the main categories.
And don't forget one for mining for those super rich surface mining deposits. [yesnod]
And don't forget one for mining for those super rich surface mining deposits. [yesnod]