How is Class D airspace visually represented on a sectional chart?

Class D airspace is visually represented on a sectional chart by using a dashed blue line. This depiction indicates the boundaries of Class D airspace, which typically surrounds airports with an operational control tower. The dashed line indicates that while the airspace is controlled, it is not as restrictive as Class B airspace, which is shown with a solid blue line. The dashed blue line signifies that pilots need to communicate with the control tower at the specified airport, but they can transition through the airspace under visual flight rules, given they remain clear of the prescribed airspace unless otherwise instructed by air traffic control. Understanding these visual cues is essential for navigation and ensuring compliance with airspace regulations.