Garmin GPS 175 Pilot's Manual page 137

APPROACH
VISUAL
APPROACH
190-02207-02 Rev. 1
DESCRIPTION AND INSTRUCTIONS
Not all airports in the database support visual approaches.
The GPS/GNX generates visual approaches, provides advisory
horizontal and optional vertical guidance for the runway, and
helps stabilize the runway approach. Published data is used to
determine the visual approach GPA and TCH for the selected
runway. If no published data is available, the default is 3º GPA and
50 FT TCH.Lateral guidance is always provided for visual
approaches.
There are three different methods for loading and activating visual
approaches. For methods 1 and 2, tapping Visual opens a list of
available visual approaches. Once selected, the visual approach
immediately loads and becomes active.
Method 1 - On the map, tap Visual. When the aircraft is within
10 nm of the destination airport the Visual key appears on the
display.
Method 2 - On the bottom edge of the screen, tap Visual. This
key is visible when a visual approach supported airport is selected
on the map during Pan mode.
Method 3 - Visual approaches load from the PROC - Approach
page or the Airport Info - Procedures tab (similar to published
instrument approaches). For information on how to use this page,
refer to Selecting an Approach.
After a visual approach loads, a confirmation pop-up shows,
detailing the glidepath angle (GPA) and threshold crossing height
(TCH) when vertical guidance is available.
Terrain and obstacle obstructions along the approach path
determine the availability of vertical guidance advisories for visual
approaches. A valid terrain database is required.
If no known obstructions are within the approach path,
•
vertical guidance is provided to a maximum distance of 28 nm
from the runway.
If there are known obstructions further than 3 nm, but within
•
the 28 nm maximum distance from the runway along the
approach, vertical guidance is limited to the approach path
after crossing the known obstructions. After loading the
approach, a shortened magenta line shows on the map. If
obstructions are within 3 nm to the runway, along the
approach path, advisory vertical guidance is not provided.
Only external CDI/VDI displays provide vertical deviation
indications.
GPS 175/GNX 375 Pilot's Guide
Navigation
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