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If Global Mapper doesn't currently allow this, I suggest you add the ability for Global Mapper to download from any Tile Map Service (see specification Here
I suspect it would be fairly easy to implement, and would allow Global Mapper users to view, as well as create their own web-compatible tiles.
It would also be nice if it allowed the user to use a local directory of tiles. For example, if a user created a map tile package, just as they currently create Google Maps tiles, they could then use the tiles locally. This wouldn't step too hard on Google or Bing Maps' toes because it is a separate specification, and is not directly compatible with their servers.
It could be made more powerful by adding the capability to upload tiles to a user-specified TMS server, making Global Mapper a better platform for maintaining web-compatible tile maps.