Version 1.6.5
To use the program, first you need to prepare the "lengths".
First get to the upper-left corner of the map, preferably with land.
To do this, count the number of tiles in each horizontal bunch. (mass)
  Example: (Dragon warrior)
  2 water tiles, 6 grass tiles, 12 water tiles, 7 grass tiles,
  15 water tiles, 8 grass tiles, etc...
Count starting at zero, and in hex. Start another when F is reached.
  Example:
  15B6E7...
Enter the data into the program, after specifying the filename and
the possible addresses of data will display in the list box.
  Example results:
  1D16-  41054B064E07
If you find nothing, first toggle the "High Bits" box.  Some games
(like Zelda 2) use it that way.
  Example: (Zelda 2)
  BD7FB1  yeilds nothing, but with High Bits on results in:
  506C-  BBDC74FCBC14
Then write a map editor or just hex-edit around.