This tool was created by by Joseph York.
It displays a scrolling map. You can click on hot spots to display additional information.
Example:

Here are the two maps:

DIB Viewer Level 3 (Atari ST)

DIB Viewer Level 5 (Atari ST)
- DIB Viewer (Atari ST)
- This archive contains an .ST disk image. Run DIB_VIEW.PRT to start the program.
- ST Action (United Kingdom)

Dungeon Master And Chaos Strikes Back Hints and Fake Cheat
ST Action (United Kingdom), Issue No 25 May 1990, Page 30