What NAV radio is covered in a warning that could possibly harm personnel?

• A. VOR
• B. GPS
• C. VHF
• D. TACAN

Answer: (D)

The concept here is RF exposure risk around navigation equipment. TACAN uses high‑power UHF transmissions to determine range and bearing, so when it’s energized the surrounding area can be hazardous to personnel due to strong RF energy. That safety warning is the kind you’d expect to see on a TACAN unit, indicating potential harm from the radio’s emissions. VOR and GPS operate at lower powers and their safety labeling isn’t typically framed as an RF‑hazard warning to personnel in the same context, and VHF (used for voice and some nav) likewise doesn’t carry the same explicit high‑RF hazard warning. So the nav radio associated with a warning that could possibly harm personnel is TACAN.