Published Approaches using GPS

Just as the system supports navigating an airway using GPS, and using GPS instead of DME, the system also supports using GPS as an alternate means of navigation for NAVAID exclusive approaches (not including localizer based approaches). Refer to the current, pertinent flight manual and regulations for information on alternatively using GPS navigation for NAVAID exclusive approaches.

When the list of approaches displays "+V", this indicates the system will provide advisory vertical guidance when using GPS to fly the approach.

212: Procedures List of Available Approaches

Table 27: Approach Service Levels
HSI Annunciation	Description	Example on HSI
LNAV	Approach to the published MDA
LP	Approach to the published MDA
LNAV+V	Approach with advisory vertical guidance to the published MDA
LP+V
L/VNAV	Approach with approved vertical guidance to the published DA
LPV

The system requires 30 seconds of valid SBAS integrity monitoring before selecting an approach that requires SBAS vertical guidance.

To ensure the system does not abort the GPS approach, both GPS receivers should have a VFOM less than 106 feet before loading a GPS approach.

The system GPS receivers will use Satellite Based Augmentation (SBAS) when available. Some approaches require the use of SBAS for lateral and/or vertical GPS navigation. Refer to the Flight Instruments section for more information vertical guidance (Vertical Deviation Indicator) and lateral guidance (Course Deviation Indicator).

Table 28: Source of Lateral and Vertical Navigation per Approach Service Level
Approach Service Level	Lateral Navigation Source	Vertical Navigation Source
LNAV	GPS	N/A
LNAV+V	GPS	GPS (advisory only)
LNAV/VNAV	GPS¹	GPS¹
LP	GPS¹	N/A
LP+V	GPS¹	GPS¹ (advisory only)
LPV	GPS¹	GPS¹
¹ SBAS required

AXIS Pilot's Guide for Experimental Aircraft

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Published Approaches using GPS