Frequently Asked Questions

APRS Chat is a mobile application that lets amateur radio operators send and receive APRS (Automatic Packet Reporting System) messages from their Android or iOS device. It supports multiple connection methods including APRS-IS (internet), TCP KISS, and Bluetooth TNC.

Yes, you need a valid amateur radio license to transmit APRS messages. You can receive and view APRS traffic without a license, but you cannot send messages or beacons without proper licensing.

APRS Chat offers both free and premium tiers. The free version includes basic messaging and APRS-IS connectivity. Premium features include advanced filtering, multiple connection profiles, and additional customization options.

APRS-IS (APRS Internet System) is a network of servers that distribute APRS data worldwide via the internet. It's the easiest way to get started - you just need an internet connection. See our APRS-IS guide for setup instructions.

An APRS-IS passcode is required to transmit messages via APRS-IS. The passcode is calculated from your callsign using a standard algorithm. APRS Chat automatically generates your passcode when you enter your callsign - no external generation needed.

Currently, APRS Chat requires a TNC (Terminal Node Controller) for RF connections. This can be a hardware TNC like the Mobilinkd TNC3 or a software TNC like Dire Wolf. We do not support direct audio modem connections at this time.

APRS Chat supports any TNC that uses the KISS protocol. Popular options include:

• Mobilinkd TNC2/TNC3 (Bluetooth)
• Dire Wolf (TCP KISS)
• Any KISS-over-TCP compatible device

APRS messages are limited to 67 characters to ensure compatibility with RF transmission. Longer messages may be truncated when gated to RF. This limit includes the message content only, not the addressing information.

ACK (acknowledgment) is a confirmation that your message was received by the destination station. Not all stations send ACKs, and some network paths don't reliably deliver them. A lack of ACK doesn't necessarily mean your message wasn't received.

Check these common causes:

• Filter settings may be too restrictive
• Destination station may be offline or out of range
• IGate coverage may not reach the destination
• Your passcode may be incorrect (for APRS-IS)

See our troubleshooting guide for more help.

An account is not required to use the basic features of APRS Chat. However, creating an account on this website allows you to submit support tickets and access premium features.

You can submit a support ticket to report bugs or request features. Please include as much detail as possible, including your device model, OS version, and app version.