Final answer:
The statement is true: J-series messages are used in military networks to convey network status, identification, positional and navigational information, and also provide Precise Participant Location and Identification for air surveillance.
Step-by-step explanation:
The statement describes a J-series message, which is a type of communication protocol used for data exchange in military networks, particularly within the scope of Link 16 type networks. These messages are crucial in a variety of applications, including but not limited to the Joint Tactical Information Distribution System (JTIDS) or the Multifunctional Information Distribution System (MIDS).
The J-series messages are indeed used by airborne Joint Units (JUs) to provide essential information such as network status, identification, positional information, and relative navigation information. Furthermore, these messages provide Precise Participant Location and Identification (PPLI), an important feature for air surveillance and combat identification, enhancing situational awareness and reducing the likelihood of fratricide.
The original statement is true: J-series messages serve the purpose of providing network status, identification, positional information, relative navigation, and PPLI for air surveillance.