Habe gerade im Changelog für das kommende Global Mapper 8 geblättert, das erste was einem gleich ins Auge sticht:
Added support for loading data from OpenGC WMS servers. This is done through the new File->Download Online Imagery/Topo Maps menu command (formerly the Download TerraServer menu command). Several sources are built-in, providing easy access to gridded elevation data for the US (NED) and the world (SRTM) as well as color imagery for the entire world. Users can easily add their own WMS data sources as well.
Das klingt vielversprechend ;D