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With the full scale introduction of the Omega system of radio navigation, which has a world-wide capability, there is considerable interest in the assessment of positional fix accuracy at various fixed sites and monitoring stations. This is because Omega necessarily suffers from diurnal and seasonal variations. A software system, based on a standard minicomputer, is described. The system has the capability of carrying out positional fix assessment. Operation of the program is illustrated with the aid of actual Omega line of position (l.o.p.) data on two frequencies.