Man-made structures appearing on the chart are cultural features. Three main factors govern the
amount of detail given to cultural features:
Scale of the chart,
intended use of the chart, and
geographical area covered.
Additional points to remember when interpreting cultural features:
Populated places, roads, railroads, installations, dams, bridges, and mines are cultural
features typically portrayed on aeronautical charts.
True representative size and shape of larger cities and towns are shown.
Standardized coded symbols and type sizes are used to represent the smaller population
Some symbols denoting cultural features are keyed in a chart legend.
Some charts use pictorial symbols that are self-explanatory and require no explanation in
Obtain an H-24B TPC and note the symbols used to portray different cultural features.
Transportation lines, consisting primarily of railroads and roads, are important features for use in
obtaining time checks along your route. When used in conjunction with other features, they help
determine aircraft position.
Dual lane highways are multiple-lane, hard-surfaced roads having a center median or divider.
Highways are indicated by a double line and are the easily identified from the air since they are
large and few in number in most areas (e.g., Interstate 10, north of Pensacola.).
Primary roads include hard-surfaced, all-weather roads that are two or more lanes in width and
are portrayed as a single thick line.
In barren areas almost all primary roads are selected for portrayal, but in built-up areas they are
shown only where space permits. Primary roads represent the characteristic configuration of the
transportation network in the area.
CHART LEGEND REVIEW