magnetic chart

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