FSX/P3D. Not really sure how to explain this new technology the MilViz cats are cooking up but they have figured out how to implement real time terrain data within aircraft flight displays. Supposedly it doesn't even matter what terrain addons you have installed. According to the developer, the elevation data is snapped in real time straight from FSX on the fly. Although the displayed resolution may be altered (3 arc second here or roughly 92.77 sq m per quad) the sample points will match up identically with what FSX is showing outside. Just have a look at this stuff! More via the source link below!