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Contouring of data by men and machines produces a collection of maps which demonstrates differences between them; exploration geologists, computer-mapping-package-builders, and managers should be aware of these differences. Machines and geologists contouring subsurface structural data were compared in terms of the ultimate accuracy of their maps. The machine versions were consistently more similar to the carbonate reef surface used for the analysis than those produced by the geologists, given specific amounts of control. However, in situations where additional information was critical (paleoslope, channel vs bar sand, regional dip, etc.) the bias contributed by the geologist proved critical to the 'correct' interpretation. Several illustrations in the form of actual exploration examples are included and discussed. The examples described and analyzed herein are presented to acquaint both the map-maker and map-user with each other's problems with the overall objective of increasing the explorational effectiveness of both. [ABSTRACT FROM AUTHOR]