magnetic chart

American  

noun

Navigation.

1. a chart showing the magnetic properties of a portion of the earth's surface, as dip, variation, and intensity.

---

Example Sentences

Working people are sad and uninspired—including the Little Girl’s overprotective mom, who has mapped out every minute of her daughter’s life on a huge magnetic chart.

From Slate

A card is now also exhibited, in a glass case near the public barometer, giving the highest and lowest readings of the thermometer in the preceding twenty-four hours.—Those who have given attention to the history of Terrestrial Magnetism are aware that Halley's Magnetic Chart is very frequently cited; but I could not learn that any person, at least in modern times, had seen it.

From Project Gutenberg