What type of charts provide pilots with magnetic variation information?

Aeronautical sectional charts are specifically designed to provide pilots with essential information for navigation, including magnetic variation. Magnetic variation, which is the angle between magnetic north and true north, is a critical component for accurate navigation and flight planning. Sectional charts feature isogonic lines, which indicate areas of equal magnetic variation, allowing pilots to adjust their magnetic compass settings accordingly and ensure navigation accuracy during flight.

The other types of charts mentioned do not focus on navigation in the same way. Terrain elevation charts primarily provide information on the topography of an area, while weather maps focus on meteorological data, such as precipitation and wind patterns. Navigation obstruction charts highlight obstacles that may affect flight paths, such as tall buildings or towers, but they do not include details on magnetic variation. Therefore, aeronautical sectional charts are the key resource when it comes to understanding magnetic variation in the context of aviation navigation.