*Question T8D05:
Which of the following is an application of APRS?*  

*Correct Answer is  A: Providing real-time tactical digital communications in conjunction with a map showing the locations of stations*  

### AI Response: (may contain errors)  

APRS, or Automatic Packet Reporting System, is a digital communication protocol used primarily in amateur radio for real-time information sharing. Let's break down the question and the choices.

### Correct Answer: 
**A: Providing real-time tactical digital communications in conjunction with a map showing the locations of stations.**

- **Explanation**: APRS is designed to transmit location data and other information in real-time. It allows users to see the positions of other stations on a map, making it useful for tactical communications, such as during events or emergencies. This capability is a core function of APRS, enabling situational awareness among operators.

### Why the Other Choices are Incorrect:

- **B: Showing automatically the number of packets transmitted via PACTOR during a specific time interval.**
  - **Explanation**: PACTOR is a different digital mode used for email and data transmission over radio. While it can report packet statistics, this is not an application of APRS. APRS focuses on location and status reporting, not on tracking PACTOR packet counts.

- **C: Providing voice over internet connection between repeaters.**
  - **Explanation**: This describes Voice over Internet Protocol (VoIP) systems, such as IRLP or Echolink, which are not related to APRS. APRS does not handle voice communications; it is strictly for data.

- **D: Providing information on the number of stations signed into a repeater.**
  - **Explanation**: While APRS can provide some information about stations, it does not specifically track the number of users connected to a repeater. This function is more aligned with repeater management systems rather than APRS.

### Summary:
- APRS is primarily used for real-time location tracking and tactical communications.
- The other options either describe different systems or functions that are not related to APRS.

This understanding of APRS and its applications will help you in the Extra Class exam and in practical amateur radio operations.