Garmin GNC 420AW GPS Receiver User Manual


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APPENDIX C
Troubleshooting Q & A
201
190-00356-00 Rev E
Full-Scale deflection and defined path for normal approach
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deection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 NM2 NM 2 NM2 NM
1
NM
1
NM
CDI Comparison: GPS vs. VOR
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