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You will also note that this guidebook uses the degree–decimal minute format for expressing GPS coordinates. The latitude–longitude grid system is likely already quite familiar to you, but here’s a refresher, pertinent to visualizing the coordinates:

Imaginary lines of latitude—called parallels and spaced approximately 69 miles apart from each other—run horizontally around the globe. The equator is established to be 0°, and each parallel is indicated by degrees from the equator: up to 90°N at the North Pole, and down to 90°S at the South Pole.

Imaginary lines of longitude—called meridians—run perpendicular to lines of latitude. Longitude lines are likewise indicated by degrees. Starting from 0° at the Prime Meridian in Greenwich, England, they continue to the east and west until they meet 180° later at the International Date Line in the Pacific Ocean. At the equator, longitude lines also are approximately 69 miles apart, but that distance narrows as the meridians converge toward the North and South poles.