DF EVALUATOR (869)
Operates at an Evaluator station centrally located within a network of radio direction finder stations. Plots hearings on aircraft in flight and evaluates the probable accuracy of fixes derived from these hearings. Relays the result of evaluation made to aircraft lost in flight for the purpose of directing such aircraft safely to destination.
Must be familiar with various chart and map projections, possess knowledge of great circle tracks, true and magnetic bearings, and conditions affecting them. Must be able to interpret ionospheric conditions as they affect bearings made by radio direction finding devices. Must be familiar with operation of a direction finder network and possess a limited knowledge of air navigation.