Garmin GPS 400 Pilot's Manual And Reference page 66

PROCEDURES
5 4
PROCEDURES
Basic Approach
Approach Examples
Operations
Select Destination
"Select" and "Load"
the approach
"Activate" the
approach
Basic Approach Operations
The GPS 400 provides non-precision approach guidance using its built-in GPS
receiver. The GPS receiver can also be used as a supplemental aid for precision
approaches, but external localizer and glideslope receivers MUST be used for pri-
mary approach course guidance.
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 1,400 GPS-only
approaches and over 3,500 GPS overlay approaches.
Many overlay approaches are complex (in comparison to GPS-only approaches).
The GPS 400 displays and guides you through each leg of the approach—automati-
cally 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.
Approach operations on the GPS 400 will typically begin with the same basic
steps:
D