Under Maps menu - Scanners submenu link, you can see a range of options of scanners.
There are 2 types of scanners:
- the Active Scanners that detect incoming fleets; from your Bases regions, your occupations regions, and any of your fleets systems.
- And the Passive Scanners that show a table list with astros, bases, fleets and debris.
The Passive Scanners are related to your Stellar Cartography tech, level 1 thru 5 increase your detection power to your Fleets system that has a Scout ship; and Deep Space Probe ships can see its whole region.
Stellar Cartography level 1 gets only the bigger astros (planets), and level 5 will get it all; with bases, debris, etc.
From level 6 to 10 its the same as 1 to 5, but now it will extend to the region (apply to DSP only).