Indicates the visual style being drawn by the map. In X-Plane, the user can choose between a number of map types, and different map types may have use a different visual representation for the same elements (for instance, the visual style of the terrain layer changes drastically between the VFR and IFR layers), or certain layers may be disabled entirely in some map types (e.g., localizers are only visible in the IFR low-enroute style).