What kind of system relies on the principles of angular data transmission?

The correct choice is based on the understanding that both communication systems and navigation systems utilize principles of angular data transmission.

Communication systems often involve transmitting information through various channels, and angular data transmission plays a crucial role, especially in systems that use directional antennas or involve any sort of spatial data, such as satellite communications. The transmission of data can be affected by the angles at which signals are sent and received, making this principle integral to effective communication.

Similarly, navigation systems rely heavily on angular data transmission as they often need to calculate angles for positioning, bearing, and direction. Technologies such as GPS depend on triangulation, which requires angular measurements from satellites relative to the receiver's position. The accuracy of these systems largely hinges on the precise understanding and application of angular data to pinpoint locations and navigate effectively.

Thus, the connection between both types of systems and the principles of angular data transmission establishes the correctness of selecting both communication and navigation systems as applicable in this context. This option encapsulates the essence of how crucial angular data transmission is within both fields, underscoring the overlap and the common principles that guide their functionalities.