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Section 3 Display Symbology
3-66
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
1
st
Ed Nov 2018
intermediate speed scales (the first between the ownship symbol and the
range ring, the second between the range ring and the compass rose) are
drawn using dashed lines. The speed range for the hover vector indication
changes based upon current groundspeed. Available speed ranges are (all
speeds represent the speed indicated at the compass rose): 20 kts, 40 kts,
and 80 kts with the currently selected speed range textually displayed
adjacent to the compass rose. Changes in speed range employ a
deadband to prevent flicker at speed range boundaries.
Figure 3-104: Hover Vector Symbology
The ownship symbol indicates 0 knots groundspeed and a dot connected
to the ownship symbol by a gray line floating over the hover page to indicate
flight direction and groundspeed. Deviation of the dot in a straight up
direction (12 o’clock position) indicates forward flight while straight down (6
o’clock position) indicates rearward flight. Deviation of the dot laterally
indicates lateral drift. Movement of the dot is constrained to less than five
knots per second to prevent jumpiness. The hover vector line and dot are
limited and cropped at the outer circle of the hover page.
3.7.3. Compass Rose Symbols
Figure 3-105: Hover Vector Compass Rose
A digital magnetic heading readout and pointer aligned with the longitudinal
axis of the ownship symbol appears on the compass rose boundary circle.
A green diamond-shaped track pointer aligned with the aircraft’s track