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When map data is being displayed, press [
⇑
] or [
⇓
] to increase or
decrease the map range respectively. The currently selected map
range is displayed in the upper right display area in magenta. The
value of the map range represents the distance from the aircraft
symbol to the outer edge of the compass rose.
Map operation is covered in more detail in Chapter 6.
360-degree FULL View and 70-degree ARC View
The SN3500 allows the pilot to switch between a traditional 360-
degree FULL view of the compass rose and a forward-looking 70-
degree ARC view. The ARC view places the airplane symbol at the
bottom of the screen and the top 70-degrees of the compass rose is
displayed. The ARC view maximizes the display of the ground track
ahead of the aircraft and provides the greatest amount of screen
area for map data.
Figure 3-4 Full view
Figure 3-5 Arc view
Press [VUE] to switch between the 360-degree and 70-degree ARC
views. This action only affects the screen display – all navigation
sources, bearing pointers, and other settings remain the same.
Auto-Slewing the Course Pointer
One unique feature of the SN3500 is its ability to automatically
rotate the course pointer to the desired course being sent digitally
from the GPS/FMS. This feature is called “auto-slew”, and is
BASIC
OPERATION
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especially useful when flying a complex flight plan as it eliminates
the burden of manually setting the course pointer for each leg of the
flight plan.
When auto-slew is activated and a GPS/FMS is selected as the
NAV source, rotating the course select knob will have no effect on
the course pointer. The message ‘AUTO – SLEW ACTIVE” will be
displayed in the center display area.
Note that certain GPS receivers such as the KING KLN-90 and
Garmin GNS 430/530 support an “OBS” or “HOLD” mode which will
override auto-slew when active.
The auto-slew function is enabled/disabled in the NAV menu as
described in Chapter 4.
Heading Bug Sync
To rapidly set the heading bug to the aircraft’s current heading,
press and release the Heading select knob.
Course Pointer Sync
To rapidly set the course pointer to the current direct-to course,
press and release the course select knob.
When no valid course information is available, such as when flying a
LOC/ILS approach, pressing the course select knob inwards will
rotate the course pointer to the current heading.
Transitioning from GPS/FMS to ILS
During an ILS approach, when the selected NAV source changes
from GPS/FMS to LOC/ILS, it may be necessary to rotate the
course pointer to the proper inbound course setting. The course
pointer is NOT set automatically by the SN3500.
MEM Function
The SN3500 maintains two different groups of
display configuration memories that are toggled
by pressing [MEM]. By pressing the [MEM], one
can rapidly swap back and forth between the
two display configurations. This allows the pilot to set up a
particular screen display and easily access the settings for later use.
