Garmin GPS 400 Pilot's Manual & Reference page 237

When does turn anticipation begin, and what
bank angle is expected?
The GPS 400 smooths adjacent leg transitions based
upon a nominal 15º bank angle (with the ability to roll up
to 25º) and provide three pilot cues for turn anticipation:
1) A waypoint alert ('NEXT DTK ###°') flashes in the
lower right corner of the screen 10 seconds before
the turn point (Figure C-6).
Figure C-6 CDI at 1 nm Scale
2) A flashing turn advisory ('TURN TO ###°')
appears in the lower right corner of the screen
when the aircraft is to begin the turn. Set the HSI
to the next DTK value and begin the turn.
3) The To/From indicator on the HSI (or CDI)
flips momentarily to indicate that the aircraft
has crossed the midpoint of the turn. For
more information on waypoint alerts and turn
advisories, see Sections 5.2 and 5.3.
190-00140-60 Rev. H
When does the CDI scale change, and what
does it change to?
If 'Auto' mode is selected for the CDI setting, when
leaving the departure airport the CDI scale is set to 1.0 nm
and gradually ramps up to 5 nm beyond 30 nm (from the
departure airport).
Also, in 'Auto' mode, the GPS 400 begins a smooth
CDI scale transition from the 5.0 nm (enroute/oceanic
mode) to the 1.0 nm (terminal mode) scale 30 nm from
the destination airport (Figure C-7). The CDI scale further
transitions to 0.3 nm (approach mode) at 2 nm prior to
the FAF during an active approach. During a missed
approach situation to return the CDI to the 1.0 nm scale,
activate the missed approach sequence by pressing the
OBS Key, as described in Section 5.2, Flying the Missed
Approach.
GPS 400 Pilot's Guide and Reference
APPENDIX C
TROUBLESHOOTING
MAP
Approach
0.3 nm
FAF
2 nm
1 nm
Terminal
1 nm
1 minute
Enroute/Oceanic
5 nm
Figure C-7 CDI Scale Transition
30 nm
C-5