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The simulation community faces the challenge of using the Distributed Interactive Simulation (DIS) protocol to network long established simulation systems that have been developed independently of each other and of DIS. Such simulators might have earth-shape representations that differ from each other and from the DIS protocol standard of the World Geodetic System 1984 (WGS-84) ellipse. These dissimilarities can cause positional discrepancies that lead to unnecessarily high rates of data transmission during steady flight. This report describes two causes of such positional discrepancy that were encountered and resolved during the conversion of a simulation network from the SIMNET protocol to the DIS. Analysis showed that the methods of resolving these discrepancies are applicable to any dissimilar systems but they cannot hide all the anomalies caused by a mismatch between systems. Recommendations are made for earth representations in existing simulators that may be used in a DIS network with minimum problems. The recommendations include defining the properties of good map projections and a method for eliminating some positional discrepancies between dissimilar networked systems. The principal difference in this report from the ITEC paper is the inclusion of a description of SIMNET from which the DIS network was developed, and the inclusion of a section on acceleration transformation presented orally at the conference but not in the written paper.