Think basic topographic map reading. In the field, how do you literally get your bearings? How do you figure out the strike or dip or whatever of some strata you find? Some get pretty complex and expensive, but there are many uses. Basically think of it as your all around geology ruler I guess.
B: Crave the Wave, Environmental Chemistry, Robo-Cross, Meteorology, Physical Science Lab, Solar System, DyPlan (E and V), Shock Value
C: Microbe Mission, DyPlan (Earth's Fresh Waters), Fermi Questions, GeoMaps, Gravity Vehicle, Scrambler, Rocks, Astronomy
Grad: Writing Tests/Supervising (NY/MI)