The outer circle marks the ideal horizon. The center of the chart represents the sky area overhead. The bigger the dot, the brighter the star it represents. Constellation names are labeled in capital letters. Star names are in mixed case letters.
Planet names are in italics.
The best way to use this chart is to pick a direction and turn to face that direction. Then hold the map up so that the letter of the direction you are facing is closest to the horizon. If you are stargazing with a full or almost full moon in the sky, or from a city or suburb, you may not see all of the stars on this chart.