Manual A/C SEA adjustment
While observing the screen and the A/C SEA tuning bar, press ◄ or ► to adjust the A/C SEA. The setting range is
3.Press the [MENU/ESC] key to finish.
1.9Suppressing Rain Clutter
The vertical beamwidth of the antenna is designed to see surface targets even when the ship is rolling. However, by this design the antenna will also pick up rain clutter (rain, snow, or hail) in the same manner as normal targets. The illustration below shows the appearance of rain clutter on the display.
The A/C RAIN control adjusts the receiver sensitivity as the A/C SEA control does but rather in a longer time period. The higher the setting the greater the
Rain clutter at screen center
1.Press the [GAIN] key consecutively until the display shown below appears.
A/C RAIN
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[GAIN] : GAIN MENU
[MENU/ESC] : Exit.
A/C RAIN adjustment window
2.While observing the screen and the A/C RAIN tuning bar, press ◄ or ► to adjust the A/C RAIN. The setting range is
3.Press the [MENU/ESC] key to finish.
1. OPERATION
1.10 Measuring the Range
The bearing to a target can be measured by the range rings, by the cursor and by the VRM (Variable Range Marker).
Measuring range by the range rings
Count the number of rings between the center of the display and the target. Check the range ring interval and judge the distance of the echo from the inner edge of the nearest ring.
Measuring range by the cursor
Operate the cursor pad to place the cursor on the inside edge of the target. Read the range to the cursor at the bottom right corner of the display.
Measuring range by the VRM
1.Press the [VRM] key to display the VRM. The message “Place VRM by cursor” appears and “VRM” in the EBL/VRM box is displayed in reverse video. The message is automatically erased after 10 seconds, or you may erase it sooner by pressing any key.
2.Operate the cursor pad to place the VRM on the inside edge of the target.
3.Check the VRM readout at the bottom left corner on the screen to find the range to the target.
To anchor the VRM, press the [VRM] key. (It is automatically anchored if there is no key operation for about 10 seconds.) To erase the VRM, press the [MENU/ESC] key.
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VRM |
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| EBL - - | RNG 3.221nm | and | |
VRM | to cursor | |||
VRM 2.910nm | TTG 00H35M | |||
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| BRG 45.6° |
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range |
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How to measure the range
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