Sorcerer's compass
InTe 10, including 50 uses/day
R: Per, D:Conc, T:Ind
This small bronze box about the size of a very large coin opens to reveal a large crosshaired hole in the middle and a complex mechanism with a number of gears, dials and needles that make it look like a miniature astrolabe. When placed on a map, in a fashion similar to that of The Inexorable Eye, it displays to the eye of a trained user its own position (alignment, distance and direction) relative to the point of the map in the crosshairs; this information changes as the compass moves.
Base 2 [learn a mundane property of itself that someone with the appropriate skills could learn just by looking -- displaying the information is free, see Frosty Breath of the Spoken Lie] +1 Conc, +1 realigns as it moves, +6 levels 50 uses/day.
Bronze provides a +3 S&M bonus to Terram; in fact, I think such an item would also qualify for the +5 bonus an astrolabe provides to navigation.