Were 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 there!"