Situational awareness is far more than buying a GPS or blindly following a magenta line. Situational awareness is far more than knowing where you are. Situational awareness is a term which encompasses every aspect of the flight, and by far the most critical tool to maintaining situational awareness is not a gadget or toy, but your brain. It's you.
Situational awareness absolutely can be taught, and it must. Any instructor who doesn't devote his or her full energy to instilling and developing situational awareness in a student is both an idiot, and a failure. Every aspect of instructing, every single bit of it, is about situational awareness.