How do you verify and configure transponder and ADS-B settings in the Longitude 700?

• A. Power down the transponder to reset
• B. Verify only that the ADS-B is receiving, not transmitting
• C. Set correct squawk code, ensure Mode S operation, verify ADS-B transmission is active and properly received by ATC
• D. Use unreliable self-check without ATC acknowledgement

Answer: (C)

The key idea is to ensure two things at once: you configure the transponder with the ATC-assigned identity and you actively transmit ADS-B Out data that ATC can rely on. In the Longitude 700, this means setting the correct squawk code on the transponder, confirming that the transponder is in Mode S with altitude reporting enabled, and making sure ADS-B transmission is active and being received by ATC. Having a valid squawk and a properly functioning Mode S transponder allows ATC to uniquely identify your aircraft and correlate your position with the ADS-B Out data being broadcast. Verifying only that ADS-B is receiving would miss the critical requirement that you are also transmitting correct, live data for ATC to use. Likewise, a self-check without ATC acknowledgement doesn’t confirm real-world reception by air traffic facilities. So, this approach ensures you’re properly identified, your ADS-B Out is active, and ATC can receive and use your transmitted data.