Garmin GTN 625 Pilot's Manual page 211

8.5 OBS
The OBS key is used to select manual or automatic sequencing of waypoints.
OBS selection is available on the Default Navigation page. Touching this key
selects OBS mode, which retains the current "active to" waypoint as your
navigation reference even after passing the waypoint (i.e., prevents sequencing
to the next waypoint). Touching the OBS key again returns to normal operation,
with automatic sequencing of waypoints. Whenever OBS mode is selected, you
may set the desired course To/From a waypoint using the pop-up window on the
GTN 6XX or with the external OBS selector on your HSI or CDI.
For leg types that do not support OBS, this key will be shown as a SUSP key.
This key will then also function as an Unsuspend key for legs that auto-suspend,
such as holds, missed approaches, etc.
NOTE: In dual GTN installations with crossfill on, the OBS course will only
be updated real time on the GTN that is receiving the new OBS course. The
course will be transferred to the other GTN when OBS is exited.
1. Touch the OBS key to enable the OBS function.
OBS Heading
GPS Level
Of Service
2. Enter the desired OBS heading using the keypad and touch
Enter.
3. The OBS heading will be shown in the flight plan annunciation
above the CDI in the lower portion of the display. The OBS
function annunciation will show.
190-01004-03 Rev. K
Active FPL Leg OBS Function
Annunciation
Figure 8-44 OBS Course Selection
Garmin GTN 625/635/650 Pilot's Guide
Foreword
Xpdr Ctrl
Com/Nav
Direct-To
Wpt Info
Weather
Touch the OBS
Key To Enable
OBS Function
Services/
Messages
Appendix
8-37
Getting
Started
Audio &
FPL
Proc
Map
Traffic
Terrain
Nearest
Music
Utilities
System
Symbols
Index