What consideration should be taken into account when using a handheld GPS for VFR navigation?

When using a handheld GPS for VFR (Visual Flight Rules) navigation, it is crucial to be aware that position accuracy may degrade without notification. This is particularly important because GPS systems can be affected by various factors such as satellite geometry, signal obstruction from terrain or buildings, and atmospheric conditions. When the accuracy degrades, the pilot might not receive any warnings or indications on the device, potentially leading to navigational errors.

Pilots need to maintain situational awareness and understand that even though handheld GPS devices are generally reliable, they are not infallible. Relying solely on GPS without considering its limitations can be dangerous, especially in critical phases of flight such as navigation over challenging terrain or in areas with limited visibility.

The other options, while related to GPS usage, do not address this critical aspect of navigational safety. For instance, battery life can vary widely among devices, but it’s not a primary consideration during navigation, unlike the potential degradation of position accuracy. Real-time traffic updates may not be a feature of all handheld GPS units, and while GPS can be a valuable tool, it should not replace traditional navigation instruments but rather complement them for the best safety practices.