How can a pilot identify if WAAS is available?

WAAS, or the Wide Area Augmentation System, enhances the accuracy and reliability of GPS for aviation use. A pilot can identify if WAAS is available by checking the GPS page for a specific indicator. The presence of a "(D)" indicates that the GPS receiver is utilizing WAAS to provide improved navigation information. This functionality is crucial for pilots, particularly when flying approaches that require precise navigation, as it helps in obtaining the necessary accuracy and integrity for instrument approaches.

Other options do not accurately reflect how to identify WAAS availability. For instance, being above 10,000 feet does not guarantee WAAS availability, as it depends on the aircraft's specific navigation equipment and operational environment. Confirming a visual approach does not pertain to WAAS status, and monitoring airspeed during a climb is related to flight performance rather than navigation system functionality. Thus, verifying the presence of the "(D)" indicator on the GPS page is the reliable method for pilots to determine if WAAS is operational.