GPS's navigator in chief

AS I DRIVE THROUGH THE VINEYARD-COVERED HILLS OF SAN LUIS OBISPO, CALIF. , THE TINY GLOBAL POSITIONING SYSTEM receiver in my phone works with Google Maps to alert me to upcoming turns. The app reassures me that I'll arrive at my destination on time, in spite of a short delay for construction. How different this trip would have been in the pre-GPS era, when the obscured road sign at one intersection would likely have sent me off track. I have a weak sense of direction, and getting lost-or worrying about getting lost-was a stressful part of my life for a long time.