The airport apron is the area of an airport where aircraft are parked, unloaded or loaded, refueled, or boarded. Although the use of the apron is covered by regulations, such as lighting on vehicles, it is typically more accessible to users than the runway or taxiway.

The use of the apron may be controlled by the apron management service (apron control or apron advisory) to provide coordination between the users. The pilot must be aware of the Apron area and with the georeferenced Apron Charts it becomes very easy for him to identify the apron area.

Approach charts are essential if an aircraft is to make a safe landing during instrument meteorological conditions (IMC) such as a low ceiling or reduced visibility due to conditions such as fog, rain or snow. In addition to the waypoints, altitudes and minimum visibility requirements necessary to line an aircraft up with a designated runway for landing, they also provide important navigational information such as course headings and navigational aids' radio frequencies.