Obs Mode - Garmin GI 275 Pilot's Manual

Enabling CDI/VDI Preview:
1) From the 'HSI' or 'HSI Map' Page, open the menu and select '(Page Name) Options'.
2) Enable the CDI/VDI Preview Button.
3) With the appropriate approach activated and NAVAID tuned in the external navigator,
verify the appropriate CDI Source is selected on the MFI (e.g., GPS1 or GPS2).
4) When the NAVAID is detected, the CDI/VDI Preview(s) appear on the 'HSI' or 'HSI Map'
Pages.
Guidance Source Auto-Switching and Prompting
When interfaced with a compatible and appropriately configured Garmin GPS Navigator
with a compatible Garmin NAV receiver, the MFI's displayed deviation source automatically
changes based on certain conditions.
If the aircraft has passed the MAP on an ILS/LOC approach, the guidance source switches
to GPS.
If on an ILS/LOC approach and the correct frequency is tuned, GPS is selected as the current
guidance source, and the AFCS is roll-coupled to a localizer, the guidance source automatically
switches to ILS/LOC before the FAF. Auto-switching only occurs with a compatible AFCS
interfaced with the MFI.
When on an ILS/LOC approach but GPS is selected as the guidance source, the CDI Button
flashes to prompt the crew to switch guidance sources.
Enabling LOC CDI prompting:
From the 'CDI', 'HSI', or 'HSI Map' Page, open the menu and select '(Page Name)
Options' > LOC CDI Prompting.
Current Track
The current track is represented on the 'HSI' and 'HSI Map' Pages by a magenta diamond
on the compass rose.

OBS MODE

NOTE: If configured with an external navigator, OBS Mode can only be enabled by
the selected external GPS navigator.
Enabling Omni-bearing Selector (OBS) Mode suspends the automatic sequencing of
waypoints in a GPS flight plan but retains the current "active-to" waypoint as the navigation
reference even after passing the waypoint. 'OBS' is annunciated when OBS Mode is selected.
While OBS Mode is enabled, a course line is drawn through the "active-to" waypoint on the
moving map. If desired, the course to/from the waypoint can now be adjusted. When OBS
Mode is disabled, the GPS flight plan returns to normal operation with automatic sequencing
of waypoints. The flight path on the moving map retains the modified course line.
190-02246-01 Rev. A Garmin GI 275 Pilot's Guide
Flight Instruments
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