My wife’s new iPhone comes with a diminutive booklet of instructions printed in type so small that my O-loupe with 2.75x mag is needed just to bring the letters into focus. (The center of the Pawtuckaway map is pellucid by comparison.) The legal department at Apple seems to have urged more than usual lawyerly elusiveness on whoever wrote the booklet, for it contains no page numbers. You’ll have to take my word that the rookie iPhoner is informed that:
iPhone contains an internal digital compass located in the upper-right corner of iPhone. The accuracy of digital compass headings may be negatively affected by magnetic or other environmental interference, including interference caused by the close proximity of the magnets contained in the iPhone earbuds. Never rely solely on the digital compass for determining direction. Compare the information provided on iPhone to your surroundings and defer to posted signs to resolve any discrepancies. Do not use location-based applications while performing activities that require your full attention.
“Never rely solely ... “ - Well, no, not if you can help it.
“Compare the information ... ” - I believe it’s called contact. “... defer to posted signs ... “ - Terrain to map, not map to terrain.
“... resolve any discrepancies.” - Don’t just wander around: relocate.
“... activities that require your full attention.” - Try not using your full attention out there and see what happens.