Why is GPS operation checked as part of radios and navigation preflight checks?

Why is GPS operation checked as part of radios and navigation preflight checks?

• A. To ensure GPS-derived data can be used for cross-checks
• B. To monitor engine rpm
• C. To verify altimeter setting
• D. To confirm transponder code

Answer: (A)

GPS operation is checked in radios and navigation preflight because GPS provides independent position and track data that you can use to cross-check other navigation readings. Verifying the GPS receiver ensures it’s functioning, has satellite visibility, and can produce valid position, groundspeed, and course data that you can compare against VOR/DME, pilotage, or dead-reckoning readings. This cross-check helps confirm nav accuracy and quickly catch discrepancies or nav system failures before flight. The other options don’t fit the purpose. Monitoring engine rpm isn’t a radios/navigation check, verifying an altimeter setting relates to pressure-based altitude, not GPS-derived navigation data, and confirming a transponder code is an ATC-related item, not part of GPS navigation verification.

GPS operation is checked in radios and navigation preflight because GPS provides independent position and track data that you can use to cross-check other navigation readings. Verifying the GPS receiver ensures it’s functioning, has satellite visibility, and can produce valid position, groundspeed, and course data that you can compare against VOR/DME, pilotage, or dead-reckoning readings. This cross-check helps confirm nav accuracy and quickly catch discrepancies or nav system failures before flight.

The other options don’t fit the purpose. Monitoring engine rpm isn’t a radios/navigation check, verifying an altimeter setting relates to pressure-based altitude, not GPS-derived navigation data, and confirming a transponder code is an ATC-related item, not part of GPS navigation verification.