Which of the following is an application of APRS?

APRS (Automatic Packet Reporting System) is fundamentally designed to provide real-time tactical digital communications. Because it transmits structured data like GPS coordinates, object statuses, and short messages, the information is commonly aggregated and displayed on a digital map, allowing operators to see the exact locations of participating stations. The other options describe completely different technologies. Voice over internet connections between repeaters describes systems like EchoLink or IRLP. Furthermore, PACTOR is a different digital mode entirely, typically used for HF email routing (like Winlink), not for mapping real-time tactical situations.