The determination of priority zones for hydrographic surveys and charting is based on manual and empirical methods permitting only to consider a limited number of factors with the tools that are used. A model composed of about twenty variable layers and typical parameters to the maritime field, to hydrography and to cartography is proposed in order to provide a base to a computerized system on microcomputer spreadsheet. The problem, the present methodology, the model, the informatics environment, the application, the data are described and the analysis of a real life example of utilization is presented
