Sperry Marine Visionmaster FT ECDIS User Manual page 45

ECDIS User Guide
Trackball Assembly
The trackball assembly comprises a trackball and two associated keys (left
and right). The trackball controls the position of the screen cursor.
Selections are made by positioning the cursor over a menu caption or
control button on the chart display and clicking (press and release) on the
left key. The right key is used to provide additional functionality such as
accessing drop down menus applicable to the function.
Throughout this manual, instructions to 'left click' or 'right click'
relate to a press-and-release of either the left key or right key.
Rotary Controls
The rotary controls include the following:

Turning the EBL control automatically switches on EBL1. Turning the
control in a clockwise or anti-clockwise direction adjusts the EBL1
bearing, see Electronic Bearing Line (EBL) in Chapter 11 Electronic
Range and Bearing Lines.

Turning the VRM control automatically switches on VRM1. Turning
the control in a clockwise or anti-clockwise direction adjusts the VRM
range, see Variable Range Marker (VRM) in Chapter 11 Electronic
Range and Bearing Lines.

The GAIN control adjusts the video gain setting for the currently
selected anti-clutter mode, see Video in Chapter 12 Radar.

The RAIN control adjusts the anti-clutter rain setting, see Video in
Chapter 12 Radar.

The SEA control adjusts the anti-clutter rain setting, see Video in
Chapter 12 Radar.
Adjustment and Acknowledgement Buttons
The RANGE buttons increase or decrease the currently selected scale ratio
by one level, see Scale Ratio in Chapter 3 Basic Operation of ECDIS.
The BRILL (brilliance) buttons change the day/night modes by one level,
see Day and Night Modes in Chapter 8 Brilliance.
Pressing the ACK ALARM button acknowledges the currently displayed
alarm announcement, see `Alert Status Indicator' in Chapter 3 Basic
Operation of ECDIS.
2-3
Basic Operation of ECDIS
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