Garmin MX20 - Manual (Page 114)

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Detailed Operation
ment key will show a Gain bar graph. The white reference line on the right side of the bar graph is only present
in the GWX 68. Values are shown in decibels in the table below.
GWX 68 aRT2000/2100 RS-181a
Gain (dB)
-28 - +3.5
(Weather and Map modes)
-31.5 - 0
(Map mode only)
-31.5 - 0
(Map mode only)
Hold Control
The Hold mode is used to freeze the display. While in the hold mode, the green RDR indicator flashes indicat-
ing that the display is not being updated, but the radar is continuing to transmit.
Cursor Pre-Select Operation (GWX 68 and ART2000/2100 only)
Cursor pre-select option can be used to pre-select a Bearing Line or Antenna Tilt angle prior to switching the
vertical or horizontal scan mode of the display. The cursor is a cyan line extending along the Radar’s projected
path and can be displayed in both the horizontal and vertical modes.
For example, if horizontal scanning is occurring, a cursor line can be activated to pre-select a specific bearing
to a weather cell of interest. Once selected, changing the scan mode to vertical will automatically set the bear-
ing of the vertical sweeps to the bearing previously indicated by the cursor line.
Conversely, if vertical scanning is occurring, a cursor line can be activated to pre-select a specific tilt to a
weather cell of interest. Once selected, changing the scan mode to horizontal will automatically set the tilt
angle of the horizontal sweeps to the tilt angle previously indicated by the cursor line.
The Bearing Cursor is activated any time the Tilt/Bearing control is changed from its default position. When
in Horizontal scanning, setting the Bearing will cause the radar to scan at that bearing when it is switched to
Vertical scanning. When in Vertical scanning, setting the Tilt will cause the radar to scan at that tilt when it is
switched to Horizontal scanning.
Sector Scan (GWX 68 only)
Sector scanning is only available in the GWX 68. Pressing the SCtR/SCAN key toggles between Sector Scan
(SCTR) and Normal Scan (SCAN). Selecting Sector Scan reduces the scan angle to ±10° in horizontal scanning
Radar
Automatic Radar Gain Control (GWX 68)
Manual Radar Gain Control (GWX 68)
Manual Radar Gain Control
(ART2000/2100 or RS-181A)