Garmin GNS 430AW, Pilot'S Manual & Reference

Page: 206 / 214

APPENDIX C
Troubleshooting Q & A
196
±
1 NM
IAF
±2 degree
angular
FAF
MAP
+350 ft
Origin = 10,000 ft
past MAP
Full-Scale deflection and defined path for normal approach
±
1 NM
Inbound track to FAF
±2 degree
angular
FAF MAP
+350 ft
Origin = 10,000 ft
past MAP
Sensitivity must change from ±1 NM FSD to either ±0.3 NM or
±2° FSD, whichever is less at the FAF. Change occurs over 2 NM
and is completed at the FAF.
Full-Scale deflection and defined path for VTF approach
Why does my CDI not respond like a VOR when OBS
mode is active?
Unlike a VOR, the CDI scale used on GPS equipment
is based on the cross-track distance to the desired course,
in OBS mode not an angular relationship to the desti-
nation. Therefore, the CDI deflection on the GPS will be
constant regardless of the distance to the destination, and
will not become less sensitive when you are further away
from the destination.
2 nm 2 nm 2 nm 2 nm
1
nm
1
nm
CDI Comparison: GPS vs. VOR