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1. OPERATIONAL OVERVIEW
1-5
1.5 Shifting the Display
1.5.1 Shifting by the trackball
The display can be shifted by the trackball up to 75% of the range in use in any direction.
Operate the trackball to shift the display, and the display shifts in the direction the trackball
is operated. When the cursor reaches an edge of the display, the pictures shifts in the
opposite direction.
1.5.2 Offcenter
Own ship position, or sweep origin, can be displaced to expand the view field without
switching to a larger range scale. The sweep origin can be offcentered to a point specified
by the cursor, up to 75% (50% in the true motion mode) of the range in use in any direction.
This feature is not available on the 72 nm range or higher.
To offcenter the radar picture:
1. Place the cursor at a position where you wish to move the sweep origin by operating the
trackball.
2. Press the [SHIFT/ZOOM] key momentarily. Then, the sweep origin is offcentered to the
cursor position. However, the heading line is left in the same position.
3. To cancel offcentering, press the [SHIFT/ZOOM] key again.
1.5.3 Zoom
Zoom enlarges an area of interest as large as twice the normal viewing. This feature is
available on the IMO-type radar only.
1. Place the cursor (+) close to the point of interest by operating the trackball.
2. Press and hold down the [SHIFT/ZOOM] key for about two seconds. The area around
the cursor and own ship is enlarged twice as large as the original size.
3. To cancel zoom, press and hold down the [SHIFT/ZOOM] key about two seconds.
Note: The zoom feature is inoperative when the display is off centered.