Garmin GNS 430AW, Pilot'S Manual & Reference

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5 - PROCEDURES
83
Basic Approach Operations
Basic Approach Operations
The 400W-series provides precision and non-preci-
sion approach guidance using its built-in GPS receiver.
The moving map pages can also be used as a supple-
mental aid to situational awareness for ILS, VOR, and
NDB approaches (and non-precision localizer-based
approaches), but the localizer and glideslope receivers
MUST be used for primary approach course guidance.
The 400W-series also provides GPS precision capa-
bility, known as LPV and LNAV/VNAV approaches.
LNAV+V approaches provide vertical guidance but are
not precision approaches.
Approaches designed specifically for GPS are often
very simple and don’t require overflying a VOR or
NDB. Currently, many non-precision approaches have
“GPS overlays” to let you fly an existing procedure
(VOR, VOR/DME, NDB, RNAV, etc.) more accurately
using GPS. To date, there are over 2,400 GPS-only
approaches and over 2,900 GPS overlay approaches
worldwide.
Many overlay approaches are more complex (in
comparison to GPS-only approaches). The 400W-
series unit displays and guides you through each leg
of the approach — automatically sequencing through
each of these legs, up to the missed approach point
(MAP). Approaches may be flown “as published” with
the full transition — using any published feeder route
or initial approach fix (IAF) — or may be flown with a
vectors-to-final transition.
Flight mode annunciations are provided in the
lower left corner of the display indicating the current
mode of flight.
Annunciation Description
LPV Follow lateral and vertical guidance to LPV
minimums. A yellow background indicates
the current VPL and/or HPL values are not
adequate for the approach and is an early
indication that downgrading will occur if
conditions do not improve.
L/VNAV GPS approach identified in the database as
LNAV/VNAV. Fly to LNAV/VNAV minimums.
LNAV+V Non-precision GPS approach with advanced
vertical guidance. Note that some LNAV/
VNAV approaches are not yet marked in
the database as such and will show up as
LNAV+V. If the chart shows the approach as
LNAV/VNAV, it can be flown to LNAV/VNAV
minimums.
LNAV Non-precision GPS approach or non-GPS
approach, such as ILS or Localizer.
MAPR Missed Approach, indicates the system is
providing missed approach integrity and
CDI full-scale deflection ±0.3NM. This also
shows that the pilot has initiated a Missed
Approach by pressing the OBS key after
crossing the MAP.
ENR En route, CDI full-scale deflection is 2.0 NM
or current CDI scale selection, whichever is
smaller.
TERM Terminal, CDI full-scale deflection is 1.0 NM
or current CDI scale selection, whichever is
smaller.
DPRT Departure, indicates the system is using
non-precision approach integrity. HAL = 0.3
and CDI full-scale deflection is 0.3 NM.
OCN Oceanic, CDI full-scale deflection is 2.0 NM.
LOW ALT
(lower window)
In LNAV+V, LNAV/VNAV, or LPV approaches,
the LOW ALT annunciation indicates the
aircraft’s estimated height is lower than the
Final Approach waypoint height by more
than the current VPL plus 50 meters.