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Reference.org
Procedural control
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<p>Procedural control (also known as non-radar control) is a method of providing <a href="/facts/Air_traffic_control/G2cQebVb">air traffic control</a> services without the use of <a href="/facts/Radar/jk9BTbFA">radar</a>. It is used in regions of the world, specifically sparsely populated land areas and oceans, where radar coverage is either prohibitively expensive or is simply not feasible. It also may be used at very low-traffic airports, or at other airports at night when the traffic levels may not justify staffing the radar control positions, or as a back-up system in the case of radar failure. </p>