4 BASIC OPERATION
The following are typical basic operation examples, which may hinder radar reception (sea clutter, precipitation in- terference and echoes from other radar).
■RAIN function
This function eliminates reflection 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 reflection echoes too much, otherwise you may miss weaker targets.
Small echos | Adjust RAIN control |
■SEA function
This function serves to eliminate echoes from waves at close range. Reduce the receiver gain for close ob- jects 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 of the screen.
Echos from sea waves | Adjust SEA control |
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 the rain or the island within 1 NM while automatic SEA function is activating.
■OFF CENTER function
Normal screen | With OFF CENTER ON |
The scanning area can be shifted in a desired direc- tion and can be enlarged partially. This is useful when the
•This function is available for 24NM or shorter range selec- tion.
*This function is not available in the TM screen.
qPush [Ù Ú Ω ≈] to move the cursor where you
want to shift the center of the screen.
•Max. offsetting is up to 75% of the screen.
wPush [ALM]/[ 
] and [MODE]/[ 
] simulta- neously to shift the screen.
ePush [ALM]/[ 
] and [MODE]/[ 
] simulta- neously again to return to the normal screen.
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