Add a map

[Laura]

I recently got Wasp 10 and Wasp Map editor. I got SRTM map for an area which is between 2 maps. I converted the SRTM maps into *.map file, and now I'm trying to make a single map file. Using Wasp map editor, I loaded the first map and then added the second one, but the problem is that there is a "blank" area between the 2 maps and I don't know how I can cancel this area or make a transparency. Could you please help me? thank you and regards.