Final answer:
LNAV/VNAV refers to Lateral Navigation/Vertical Navigation and is considered a non-precision approach as it does not provide the precise guidance required for precision approaches like ILS.
Step-by-step explanation:
The term LNAV/VNAV refers to a type of aircraft approach technology. LNAV stands for Lateral Navigation, and VNAV stands for Vertical Navigation. When combined, LNAV/VNAV refers to a method that provides lateral and vertical guidance to an aircraft during an approach.
LNAV/VNAV is a non-precision approach because, while it provides guidance in both the horizontal and vertical planes, it does not meet the precision approach criteria, which typically include a glideslope of 2.5 to 3.5 degrees that is aligned within a certain accuracy threshold to the centerline of the runway. In contrast, a precision approach, such as an Instrument Landing System (ILS) approach, provides more precise lateral and vertical guidance to pilots, generally with the aid of ground-based navigation equipment.