The default values in the map dialog are the same, no matter what DEM you load,
ith the exception of the lat long values. The lat-long values should be the bottom left of YOUR DEM. You will have to change them to the bottom left of the map you are trying to create (which should always be a higher number than the default values). If the default values for lat long in the map dialog do not match what you think should be the bottom left lat long of the DEM you created using SRTM data, you might need to recreate the DEM.
To get a map that EXACTLY replicates the terrain on Google Earth, you will need the m/s and alpha angle for the map section.
The m/s entry is, literally, the number of meters in every arcsecond of longitude. The Alpha number is the difference between true north and grid north in mils (6400 mils per 360 degrees).
You can determine this data in a number of ways, but the best way is by loading the USGS DEM in MicroDem. This is a free download available here:
http://www.usna.edu/Users/oceano/pgu...e/microdem.htm
Use the info function to get the grid transform angle. That angle will be in degrees, which you can convert to mils. To figure out the m/s, you may have to divide the total width of the map in meters by the total width of the map in arcseconds (3600 if you have a 1 degree by 1 degree DEM).
There is nothing to be done about the edge effects on the bitmap. It is a quirk of the drawing program.