Allows you to decode the SelCal (Selective Call) transmissions received by your HF (High Frequency) air band receiver using your PC sound card. The program receives information from your sound card in real-time, which it organizes according to frequency, and then scans for the frequencies with greater power peaks. The two greatest peaks of each SelCal tone represent the two letters being transmitted in the SelCal. In addition, AirNav SelCal Decoder gives you real-time information on the decoded aircraft (registration, type, company), enables you to generate reports in TXT format, and lets you modify the decoded data.