Transmission loss as a function of depth and range are presented in color contour displays. Black and white contour plots are not as effective compared to the color plots which make the information easier to assimilate. However, the color selection is an important consideration in that it can bias interpretation. The color transmission loss displays can be effectively used to judge quality and significance of the predictions. This is demonstrated in this paper by model comparisons using PE, RAYMODE, and FACT. Predictions from all these models at 500 Hz and 15 kHz in a surface duct environment are presented. The PE model is used to illustrate the effects of sound velocity and bathymetry range dependence. [Work supported by WHOI PO 29518 under NORDA Code 270 Contract N00014‐80‐C‐0381.]