It added a Fortressescraft like scanner that could find ores or villages etc. You click the device and a wave would spread out and the targeted objects would have an outline around them for a while. Anyone remembers it?
Have you tried searching Google with those keywords...?
Yeap, got a lot of pages on how FortressCraft is a rip off of Minecraft and other things but not a mod name.
https://www.google.com/search?q=minecraft fortresscraft scanner&oq=minecraft fortresscraft scanner&gs_l=psy-ab.3...1959452.1964307.0.19645220.127.116.11.0.0.0.119.2394.29j2.31.0....0...1.1.64.psy-ab..0.30.2306...0j0i131k1j35i39k1j0i67k1j0i20i264k1j0i22i30k1j33i160k1j33i21k1.0.EcdsPaHyh3E
Sweet! Thank you Herb.