On a GPS with WAAS capability, what does "LNAV+V" signify?

The designation "LNAV+V" on a GPS with WAAS (Wide Area Augmentation System) capability indicates that advisory vertical guidance is provided as an aid during the approach. This means that while lateral navigation provides lateral guidance along the approach path, the "V" signifies that there is optional vertical guidance that pilots can use to help maintain the desired altitude during descent. This vertical information alerts pilots to the proper glide path or vertical profile they should ideally follow, although it is not a mandatory requirement for the approach itself.

Pilots using LNAV+V are encouraged to utilize the advisory vertical guidance to improve the accuracy of their descent profile, but they have the flexibility to manage their vertical navigation without being required to adhere strictly to it. This enhances situational awareness, especially in conditions where a more precise descent path is beneficial.