We’re on That Mountain over There

My son and I became lost while hiking high in the southern Rockies. I immediately went to work with my map and compass to determine where we had gone off course. My son, an electronics engineer, produced from his pack a hand-held Global Positioning System receiver.
“I know exactly where we are,” he proudly announced, after carefully locking the instrument on four satellites high above the earth and checking his map. “We’re on that mountain over there!”