Radar Tower

A Radar Tower is a building which is used for revealing an area on the Map. After being powered, it scans the surrounding area every 5 minutes up to 10 times, increasing in range with each scan. The starting range is based on the height and line-of-sight of the tip of the tower, so placing it at the highest elevation possible for maximum efficiency. Any terrain at an elevation higher than its tip, or area blocked by a terrain feature such as the stone arch near the grass field will not be revealed.

Four well-placed radar towers will cover the entire map with a minimal black (unexplored) area remaining.

This is acquired via Crystal Oscillator research: Tier 5 -- Radar Technology