The control panel grid button or the keyboard D key activate the range
finder one of three ways. The first time an outline appears around the
area one space away from the player in all directions. The second time
another outline appears around the area two spaces away from the player.
The third time the outlines disappear again.
The outlines show which playing field characters are within one or two
space of the player. This also helps to find where the player is when
the playing field becomes too crowded with robots and scrap heaps. The
outlines follow you wherever you move. The range finder is equivalent
to the 'dots' command in the original Robots game.