PostgreSQL with PostGIS is generally understood as a flag ship of open source RDBMS. With no doubts its functions fully covers all requirements on vector and raster data processing of advanced GIS. On other hand the possibility of simple and fast spatial visualisation of the queries is limited. Widely used GIS applications offer certain solutions, but their approach have some limits in data scale and usability. They might be also seen as too complex. The aim of this paper is to introduce the PostMap what is an server side software that will make output of SQL queries available through simple REST services with respect to simplicity and easy ussage. For that propose the KML format is chosen. PostMap also includes mechanisms that helps to simplify the output data so that even large scale results can be easily cartographically visualised. Benefits of the developed application is in simple access and straight forward visualisation with the utility of SQL together with comprehensive list of spatial functions available in PostGIS. The developed application can be useful for data mining and spatial analyses as well as for education proposes in the field of the spatial databases.