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3
BASIC OPERATION
The following are typical basic operation examples, which may hinder radar reception (sea clutter, precipitation
interference and echoes from other radar).
■ RAIN function
Adjust RAIN control
Small echos
This function eliminates echoes from rain, snow, fog
etc.
• Rotate the control fully counterclockwise to deactivate the
control function. The RAIN indicator (
) disappears.
• NOTE: DO NOT reduce the echoes too much, otherwise
you may miss weaker targets.
■ SEA function
Adjust SEA control
Echos from sea waves
This function serves to eliminate echoes from waves at
close range. Reduce the receiver gain for close objects
within a radius of 8 miles to eliminate sea clutter.
• Rotate the control fully clockwise to activate the automatic
control function. SEA indicator (
) appears in the upper
left corner of the screen.
■ OFF CENTER function
With OFF CENTER ON
Normal screen
The scanning area can be shifted in a desired direction
and can be partially enlarged. This is useful when
Head-up* screen is selected, and you want to enlarge
the bow direction display, or the center of the screen
shifts in the direction of the intersection.
• This function is selectable for 24NM or shorter ranges.
*This function is not selectable in the TM screen.
q Push [p] [q] [t] [u] to move the cursor where
you want to shift the center of the screen.
• Max. offsetting is up to 75% of the screen.
w Push [ALM]/[ ] and [MODE]/[ ] simulta-
neously to shift the screen.
e Push [ALM]/[ ] and [MODE]/[ ] simulta-
neously again to return to the normal screen.
WARNING: The [SEA]/[ ] control re-
duces the receiver sensitivity of objects within 8
miles. Therefore, caution and careful adjustment are
necessary when using the [SEA]/[ ] control.
Small objects may not be displayed on the screen
when strong echoes from rain or islands within 1 NM
while the automatic SEA function is activated.
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