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

The significance of "LNAV+V" displayed on GPS with WAAS capability is that it provides advisory vertical guidance during descent. When flying an approach, the "LNAV+V" indication suggests that the system is offering vertical guidance that is not officially part of the approach procedure but can aid the pilot in achieving a more precise three-dimensional approach to the runway. This vertical guidance helps the pilot maintain the correct descent profile, enhancing situational awareness during an approach phase.

It's important to note the distinction here; "LNAV+V" does not confirm that the approach minimums have been met, nor does it indicate that there is a valid GPS signal as that would typically be indicated in a different manner. Additionally, it does not suggest GPS signal loss, as this would also be indicated by other alerts or messages. Instead, the focus is on the advisory guidance that assists in approaching the runway more effectively.