3-58 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. BNavigation3.18 Flight Procedure BasicsNOTEAdvisory climb altitudes for SIDs may not match charted altitudes. Do notrely solely on advisory altitudes.• Always check the runway, transition, and waypoints for all procedures.• Heading legs indicate in white as “HDG XXXº” on flight plans.• The unit provides lateral and, when appropriate, vertical guidance for visualand GPS/RNAV approaches.• Use Map as an aid to situational awareness during ILS, VOR, NDB, andnon-precision localizer-based approaches. A magenta line depicts the activeleg (or the portion of the approach currently in use).• Always use the appropriate radio navigational aid for primary approachcourse guidance during non-GPS approaches.• Check the annunciator bar for the current phase of flight.• Many non-precision approaches have GPS overlays, improving accuracy sothat approaches do not require overflying a VOR or NDB.• The unit guides you through complex overlay approaches, automaticallysequencing each leg up to the missed approach point.• Fly approaches as published with the full transition using any publishedfeeder route or initial approach fix, or with a vectors-to-final transition.• While not required under TSO-C146e, an optional baro-corrected altitudesource is recommended for automatic sequencing of altitude leg types.When adding procedures to a flight plan:• Arrange procedures around the existing flight plan as follows:Departure, En route, Arrival, Approach• Insert departure waypoints before en route waypoints• Insert arrival waypoints between en route and approach waypoints• Always verify that the transition waypoints between each phase are correctMap complements your printed approach plates by improving situationalawareness during the approach. It does not replace printed approach plates.Always fly an approach as it appears on the approach plate.
