A new function of maps on geoinformation websites is presented in this paper. Following the theory of communication, a map is defined as the transfer of information between the creator and the recipient, but it may be also a graphical user interface. The map often becomes just the cartographic interface, for which the spatial location is the basic information. Development of website user interface functionality allows to introduce advanced methods of geodata integration, management and webservices use and maintenance, not only cartographic geovisualization in Internet.