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Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. A

C-2

APPENDIX C

mation from the current database to deﬁne the waypoints.

If the database is changed or updated, the G1000 system

automatically updates the information, provided the pro-

cedure has not been modiﬁed. Should an approach, de-

parture, or arrival procedure no longer be available, the

ﬂight plan becomes locked until the procedure is deleted

from the ﬂight plan.

Can “slant Golf” (“/G”) be filed using the

G1000?

“/G” may be ﬁled for a ﬂight plan. The G1000 system

meets the requirements of TSO-C129 Class A1 or A2 in-

stallation. Non-precision GPS approaches are not to be

ﬂown with an expired database. See the approved Aircraft

Flight Manual Supplement (AFMS) as well as the Aeronau-

tical Information Manual (AIM) for more information.

What does the OBS softkey do?

The OBS softkey is used to select manual sequencing

of waypoints. Activating OBS mode sets the current ac-

tive-to waypoint as the primary navigation reference and

prevents the system from sequencing to the next waypoint

in a ﬂight plan. When OBS mode is cancelled, automatic

waypoint sequencing is continued, and the G1000 auto-

matically activates the next waypoint in the ﬂight plan

once the aircraft has crossed the present active waypoint.

Normal (OBS not activated)

• Automatic sequencing of waypoints

• Manual course change on HSI is not possible

• Always navigates ‘TO’ the active waypoint

• Must be in this mode for ﬁnal approach course

OBS

• Manual sequencing - ‘holds’ on selected waypoint

• Manually select course to waypoint from HSI

• Indicates ‘TO’ or ‘FROM’ waypoint

• Cannot be set for ﬁnal approach course or pub-

lished holding patterns

When OBS mode is active, the G1000 allows the pilot

to set a desired course to/from a waypoint using the CRS/

BARO knob and HSI (much like a VOR).

One application for the

OBS softkey is holding pat-

terns. The OBS softkey is used to suspend waypoint se-

quencing and select the desired course along the waypoint

side of the hold. For many approach operations, setting

and resetting of waypoint sequencing is automatic. Hold-

ing patterns that are part of an approach automatically

disable waypoint sequencing, then re-enable waypoint

sequencing after one time around the holding pattern. To

ﬂy the holding pattern a second time, press the OBS soft-

key. An example of this operation is an approach which

begins with a holding pattern at the initial approach ﬁx

(IAF).

The most common application for using the OBS soft-

key is the missed approach. The G1000 suspends au-

tomatic waypoint sequencing (indicated by a “SUSP” an-

nunciation placed on the HSI) when the missed approach

point (MAP) is crossed. This prevents the G1000 from

automatically sequencing to the missed approach holding

point (MAHP). During this time, the OBS softkey desig-

nation changes to SUSP. Pressing the SUSP softkey reac-

tivates automatic waypoint sequencing. The OBS softkey

then resumes its normal functionality.

WARNING: The G1000 does not provide guid-

ance to the missed approach hold point (MAHP).

Always follow published missed approach proce-

dures when ﬂying a missed approach.

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