The term "direction finding" has various synonyms related to locating the source or direction of a signal. Direction finding can be replaced with signal localization or signal tracking. These synonyms are often used in the field of radio communication and navigation. Another synonym for direction finding is radio direction finding (RDF), which involves the use of specialized equipment to determine the location of a radio transmitter. This method is commonly used by military and law enforcement agencies to locate illegal broadcasts and track targets. In the context of aerial navigation, direction finding can also be referred to as heading determination.