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The legend for a chart states that the procedure is an APV Baro or APV SBAS instrument approach procedure. The significance of this is that the approach is an approach procedure with vertical guidance, which is....
  • A
    3D precision approach down to minima published as DA or DH.
  • B
    2D non - precision approach down to minima published as MDA, LNAV or LP.
  • C
    2D non - precision approach down to minima published as LNAV or LP.
  • D
    3D approach down to minima published as LNAV/VNAV or LPV.

RNP approaches with vertical guidance are known as APV approaches. APV approaches can be one of two types, distinguished by how the vertical guidance is provided. Lateral guidance is always GNSS.

Vertical guidance will either be based on barometric data - in APV baro, Baro VNAV or LNAV/VNAV approaches, or a geometric path created using GNSS signals and the Satellite-Based Augmentation System (SBAS) for the region of operation - APV SBAS or LPV approaches.

These approaches include a virtual glidepath and comparison of the aircraft's vertical position with that virtual glidepath, As such, they are "3D" operations.

LNAV/VNAV is a 3D approach with Barometric vertical guidance (APV Baro).

LPV is a 3D approach with vertical guidance (APV), like a conventional ILS, but using GNSS augmented by SBAS.

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