Dynon Avionics EFIS-D10A Pilots Users Guide - Manual (Page 55)

HSI Operation
HS34’s knob must be used to set the OBS; the SL30’s OBS is overridden by the course information sent out by
the HS34.
3. Course Deviation Indicator (CDI). When tuned to a VOR, the CDI indicates how far
to the left or right of your selected radial you are. Full scale deviation indicates ten
degrees of deviation from the radial that has been chosen as the course. When tuned
to a localizer, full scale represents 2.5 degrees of deviation. When on course, the
course indicator and the CDI make a solid line, making it easy to see when there is
little error in your aircraft's position. Unlike a CDI indicator found in basic aircraft,
the CDI needle on an HSI rotates with the DG and course indicator. By turning the aircraft towards the CDI
needle you reduce your deviation.
4. To/From indicator. Because an HSI rotates the course line on top of the DG, the to/from indicator
always points TO the physical VOR or localizer transmitter. If it is pointing the same direction as the
arrow at the end of course line, then that is a "to" indication. If it is pointing the opposite direction of
the arrow at the end of the course line, then that is a "from" indication. This data comes from the
to/from flag indicator provided by your Nav radio. In the image above, the to/from indicator is
showing a “from” indication.
5. Glideslope Indicator. This appears only when tuned to an ILS. It displays deviation as 0.5 degrees
when deflected full scale. This does not have an indicator on it unless the glideslope is valid as defined
6. Glideslope flag. This app
by the glideslope flag.
ears when the radio is tuned to a localizer and the glideslope is not
e and standby VORs.
valid. When this is active, there is no indicator mark on the GS scale.
7. Bearing To indicators. These arrows show you the bearing to the activ
This is the direction that you would need to fly to go directly from where you are to the
transmitter. When flying directly on course, your bearing and course lines overlap one
6-6 EFIS-D10A Pilot’s User Guide