Which statement is true regarding Instrument Departure Procedure (DP) charts?

The statement that the pilot must possess at least the textual description of the approved Departure Procedure (DP) is accurate. For IFR departures, when utilizing a DP, it is essential for pilots to have the necessary information to ensure a safe and compliant departure. The textual description provides crucial details about the DP, including waypoints, altitudes, and the specific procedures to follow after takeoff.

While possessing the graphical representation of a DP can greatly enhance a pilot's situational awareness, it is mandatory that they at least have the textual information at hand. This requirement ensures that pilots can perform their pre-flight planning with all necessary details, which is vital for operational safety.

The other statements may imply misunderstandings about DP requirements. While DPs can technically be optional under certain conditions, in practice, pilots are encouraged to use them, as they facilitate safe departures in accordance with air traffic controlled operations.