What is frequency coordination on VHF and UHF bands?

Frequency coordination is a voluntary but highly recommended process used to assign specific operating frequencies to amateur radio repeaters. Its primary goal is to minimize interference between neighboring repeaters that share the same VHF or UHF bands. Because repeaters are placed at high elevations and broadcast over large areas, two repeaters operating on the same frequency that are too close geographically will cause severe interference for their users. A local, volunteer coordinating body analyzes geographic spacing, terrain, and existing repeater usage to recommend clear frequency pairs for new machines. The other options describe different amateur radio concepts. 'Band plans' dictate where certain modes (like CW, digital, or voice) operate across an entire band. Contest planning is an individual operating strategy, and simplex frequency selection is done casually by individual operators, neither of which involves the formal coordination required for permanent repeater installations.