What is the significance of "LNAV+V" displayed on GPS with WAAS capability?

The significance of "LNAV+V" displayed on a GPS with WAAS (Wide Area Augmentation System) capability relates to the provision of advisory vertical guidance during a descent. When "LNAV+V" appears, it indicates that the system is offering enhanced lateral navigation (LNAV) along with vertical guidance that is advisory in nature. This means that while the system is providing a more precise lateral track to follow, it is also suggesting a vertical profile that pilots can utilize to aid in their approach. The advisory nature of this vertical guidance is essential for helping pilots maintain an optimal descent path, although it is not a requirement for minimums.

The presence of "LNAV+V" implies that the GPS is functioning within its precision parameters, enhancing situational awareness and safety when conducting approaches, especially in instrument meteorological conditions. This added guidance assists pilots in maintaining an appropriate descent rate and approach trajectory, contributing to a smoother and safer landing experience.