APPENDIX C
Troubleshooting Q & A
209
What does the OBS key do and when do I use it?
The
OBS
key is used to select manual (OBS mode) or
to suspend automatic sequencing of waypoints. Activating
OBS mode (as indicated by an
annunciation di-
rectly above the
OBS
key) holds your current “active to”
waypoint as your navigation reference and prevents the
GPS from sequencing to the next waypoint. When OBS
mode is cancelled, automatic waypoint sequencing is
selected and the 500W-series unit automatically selects
the next waypoint in the flight plan once the aircraft has
crossed the present active-to waypoint.
NORMAL
(no “OBS” annunciator)
OBS
Automatic sequencing of
waypoints
Manual sequencing-
“holds” on selected
waypoint
Change in HSI does not
affect CDI deflection
Manually select course to
next waypoint from HSI
Always navigates “TO” the
active waypoint
Will indicate “TO” or
“FROM” waypoint
Must be in this mode for
final approach course
Cannot be set for final ap-
proach course or published
holding patterns
When should I use the OBS key to return to auto
sequencing, and what happens when I do?
The most common application for using the
OBS
key
is the missed approach. The 500W-series unit suspends
automatic waypoint sequencing (indicated by a “SUSP”
annunciation directly above the
OBS
key; see left) when
you cross the missed approach point (MAP). This pre-
vents the 500W-series unit from automatically sequencing
to the missed approach holding point (MAHP). If a missed
approach is required, press the
OBS
key to return to au-
tomatic waypoint sequencing and sequence the approach
to the MAHP. See
Section 5 - Procedures - Flying the Missed
Approach
for more information on missed approaches.
Why won’t my unit automatically sequence to the next
waypoint?
The 500W-series unit only sequences flight plan
waypoints when automatic sequencing is enabled (i.e.,
no “OBS” or “SUSP” annunciation directly above the
OBS
key). For automatic sequencing to occur, you must also
cross the “bisector” of the turn you are navigating. The
bisector is a perpendicular line between two flight plan
legs which crosses through the waypoint common to both
legs.
Summary of Contents for GNS 530W
Page 1: ...500W Series Pilot s Guide Reference...
Page 10: ...INTRODUCTION viii Blank Page...
Page 90: ...4 FLIGHT PLANS 80 Blank Page...
Page 152: ...6 WPT PAGES 142 Blank Page...
Page 196: ...9 AUX PAGES 186 Setup 2 Page Blank Page...
Page 208: ...12 MESSAGES ABBREVIATIONS NAV TERMS 198 Blank Page...
Page 228: ...APPENDIX D Index 218 Blank Page...
Page 229: ......
