Furuno CH-250 - Manual (Page 67)

3-17
SECTOR control
For the vertical fan display: When the display sector is 6° (minimum) the tilt angle of the
horizontal and vertical fan modes are interlocked and each transmission on the horizontal
display is reflected on the vertical fan display. The message TILT ANGLE MONITOR WINDOW
momentarily appears on the screen and the vertical bearing cursor disappears.
Note: Only the [SECTOR] control may be operated in this condition.
The size of the vertical scan and horizontal displays and the location of the vertical scan display
may be changed as desired. Press the key to change the arrangement as in the figure
below.