In order to display terrain and other graphical information, you must purchase a GNS-XLS with the middle part number series -0203 and related required software updates. Of course, as with any multi function type display, there are other remote units and processors required to use these features. For example, you must interface a compatible Ground Proximity Warning Computer with the GNS-XLS to receive and display terrain information on the GNS-XLS. In order to receive and display graphical weather and Automated Flight Information Services (AFIS) information on the GNS-XLS, you must purchase and use an AFIS Data Management Unit (DMU) and Remote Processor Unit (RPU). The additional cost for this information interface is approximately $40000-$45000 not including any related information subscription services. The DMU purchased will also depend on the data link format that will be utilized (i.e. Aero H, H+, I or C Satcom). AFIS installations that do not include a dedicated VHF antenna require a single Antenna Switching Unit (ASU) as well.