Map load is a property quantifying the amount of map content. It indicates the level of map complexity and is important characteristics for map generalisation. To find a piece of information in a map quickly has always been an important issue of cartography, especially in crisis management and military mapping. However, to keep a map easy-to-read is essential also in maps for schools. The optimal level of map load, therefore, may differ according to the map aim, user skills, knowledge and surrounding conditions.