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Actually, I think the online mode only needs a way to view obstacles on the battlefield, hence the title. So here it is:
Now, the obstacle viewing base for all standard terrain types is ready: dirt, sand, grass, snow, swamp, rocks, underground, lava, water (currently only supports 1 ship or 2 ship battle modes, hero battle mode is not yet available...) and coastal terrain.
So, you download the editor and either open a map, find a cell where you're interested in seeing the obstacles on the battlefield, and click the button to view them.
Or, you launch the editor, select the terrain type and two coordinates (x and y) in the corresponding windows, and click the "obstacles" button to view the battlefield. This mode is for online players (although there's currently an issue with how to find the coordinates in the game; the solution would be a script for the Town Editor/World Editor, but there's a problem with that in the community).
Here's the link: http://www.phomm.narod.ru/programs/h3mtered.htm. There's also a sample map on the page to show what this whole thing is for.