Scanner Coverage overlay

The radius of each circle is that scanner's detection range.

Use the Scanner Effectiveness dropdown to scale down the displayed coverage and look for areas of lesser coverage that an enemy fleet might sneak through. For example, setting the displayed coverage to 30% shows paths that a fleet with 70% or better cloaking could pass through undetected. Reducing the displayed coverage does not change the actual coverage.

Circular areas around planets:

The radius of each circle is that scanner's detection range. Your basic (non planet-penetrating) radar coverage appears in RED. Any object orbiting the planet is hidden from your radar.

Extended (planet-penetrating) radar coverage appears in YELLOW. These scanners can detect fleets in orbit around a planet. They also can tell you planetary statistics from a distance.