Garmin GNS 430 - Manual (Page 40)

GNS 430(A) Pilot’s Guide and Reference 190-00140-00 Rev. P
SECTION 3
NAV PAGES
3-6
To select a map range:
1) Press the up arrow of the RNG Key to zoom
out to a larger map area.
2) Press the down arrow of the RNG Key to zoom
in to a smaller map area and more detail.
An autozoom feature is available which automatically
adjusts from an enroute range of 2000 nm through
each lower range, stopping at a range of 1.0 nm when
approaching the destination waypoint. The autozoom
feature is turned on/off from the Map Setup Page (described
in Section 3.4).
The Map Page also displays a background map (or
“basemap”) showing lakes, rivers, coastlines, highways,
railways, and towns. When a map range is selected below
the lower limit at which the map detail was originally
created, an ‘overzoom’ indication appears on the Map
Display, below the range reading (Figure 3-9). The
basemap has limited accuracy, and should not be used
for navigation, but only for non-navigational situational
awareness. Any basemap indication should be compared
against other navigational sources for accuracy. Continuing
to zoom in to lower range settings will cause ‘overzoom’ to
be replaced with ‘no map’ and the geographic detail will
be removed from the Map Display (airport and NAVAID
remain).
Figure 3-9 Overzoom on Map Page
The ‘Setup Map?’ option (described in Section 3.4)
allows the pilot to define the maximum range at which
each map feature appears. This provides the pilot with
complete control to minimize screen clutter. The pilot
can also quickly remove items from the map using the
CLR Key.
To quickly declutter the Map Display:
Press the CLR Key momentarily (as often as
needed) to select the desired amount of map
detail.
The CLR Key allows the pilot to quickly declutter the
Map Display, providing four levels of map detail. Note the
‘-2’ (‘-1’ and ‘-3’ are also provided) suffix designation in
Figure 3-10, indicating each successive declutter level.
Map Detail Level
Figure 3-10 Detail Level on Map Page
The right-hand side of the Map Page includes four
user-selectable data fields (Figure 3-8). By default, the
displayed data is: destination waypoint name (WPT),
desired track (DTK), distance to destination waypoint
(DIS), and ground speed (GS). Any of these data fields
may be changed to display a different data type, as outlined
in Section 3.4. The four data fields can also be removed
from the map to show a larger map image, as described in
Section 3.4.