EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 182-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
Figure 12.19 - 360 Compass Mode
The ARC HSI mode, presents traditional rotating CDI symbology which resembles that
used in the HSI 360 Compass mode. The ARC CDI mode presents a fixed, non-rotating
CDI resembling that used in contemporary GPS navigation displays.
Figure 12.20 – ARC HSI Mode Figure 12.21 – ARC CDI Mode
Lateral and Vertical Deviation Indicators
A Lateral Deviation Indicator (LDI) is presented on the attitude indicator whenever the
pilot has selected an ILS, LOC, LOC(BC), or a GPS Approach Mode to the HSI and valid
lateral guidance is being provided.
Back course deviation indications are automatically corrected for reverse sensing.
Therefore, there is no further pilot action required to enable reverse sensing other than
setting the inbound course on the HSI. “BC” will be annunciated to the left of the “LDI”
indicator.
A Vertical Deviation Indicator (VDI) is presented on the attitude indicator whenever the
LDI is shown and valid vertical guidance is provided, such as from an ILS or WAAS GPS
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