Dynon Avionics EFIS-D100 Pilots Users Guide - Manual (Page 53)

HSI Operation
6. Winds aloft. This indicator, located at the bottom of the HSI page, appears only when you have GPS data and
true airspeed available to the instrument. The arrow is the wind direction relative to your aircraft. It is alway
the same size and only indicates wind direction. The numbers below are absolute wind direction (magnetic) and
absolute wind speed. Below that, labeled as "XW" is the crosswind component of the wind. Wind data is
calculated while in stable flight with very little turn rate. It uses the GPS ground speed and track to compare to s
the magnetic heading and the true airspeed that the EFIS calculates. In order for winds to be correct, the
n the EFIS must all be accurate.
ty
cy, and the bearing to the
n
t
s course is set
airspeed, OAT, and compass o
Navigation Radio Overlay
The figure at right shows an HSI page with information sourced from a navigation radio. This
data could be a VOR or a localizer. The various elements are described below.
1. Text displays. The text displays (located at the top of the HSI Page) provide a varie
of information. Displayed here is the course/OBS setting, the active frequency that
the SL-30 is tuned to, the identifier for the tuned frequen
active and secondary frequencies. When the data is not available or is not valid, the
various data fields in this area are replaced by dashes.
2. Course indicator. The green course indicator (shown pointing to 273º at right) has a
arrow at its end which points to the currently selected course (OBS) on your NAV
radio. This setting is also shown in the text area as "OBS." When tuned to a VOR,
this is the radial that you wish to fly. When tuned to an ILS, this is set to the runway
heading. In a situation with no winds, keeping the course indicator pointed straight
up and in line with the heading pointer keeps the aircraft on course. This indicator is
fixed to the rotation of the DG, so it is easy to see which way you must turn to get on course. The course
indicator is only present when you are tuned to a VOR or a localizer. If the NAV radio indicates that you are no
currently tuned to an active frequency, this indicator is not displayed. The direction of thi
6-4 EFIS-D100 Pilot’s User Guide