Furuno FR-8111 Adjusting Brilliance of Control Panel and Markers, Adjusting Range Ring Brilliance

1.9Adjusting Brilliance of Control Panel and Markers

The brilliance of the control panel and markers can be adjusted on the BRILL menu. The head- ing marker is visible when set to zero.

1)Press the MENU key.

2)Select the BRILL menu.

3)Press the ENTER/SELECT key.

BRILL1

Sel Item by VRM & hit ENT.

PANEL	HDG MARK	PLOT
TRAIL	VRM/EBL	OS MARK
			Current
			level
CHAR	CURSOR

Setting

Figure 1-8 BRILL menu

4)Select appropriate menu among the following and press the ENTER/SELECT key.

PANEL, TRAIL, CHAR, HDG MARK, VRM/EBL, CURSOR, PLOT, OS MARK

Note: The OS MARK (Own Ship Mark) is not available on the N-type radar.

5)Operate the VRM or EBL control to set bril- liance.

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Note: The OS MARK (Own Ship Mark) is not available on the N-type radar.

1.10Adjusting Range Ring Brilliance

Push in the RINGS (PUSH) control to adjust range ring brilliance/turn the range rings on or off. Each pressing of the key adjusts the brilliance of the rings (in four levels) or turns them off.

1.11 Suppressing Sea Clutter

In rough weather conditions returns from the sea surface are received over several miles around own ship and mask nearby targets. This situation can be improved by properly using the automatic anti-clutter function and/or the A/C SEA control.

Automatic anti-clutter control

The easiest way to suppress the surface clutter is to use the automatic anti-clutter function. Press the A/C AUTO switch.

WARNING

The auto A/C function can erase weak targets.

Manual anti-clutter control

From the fully counterclockwise position, slowly turn the A/C SEA control clockwise. For opti- mum target detection, leaves speckles of the sur- face return slightly visible.

Sea clutter at	A/C SEA control adjusted;
display center	sea clutter suppressed
	Figure 1-9

The anti-clutter sea facility is often referred to as STC (Sensitivity Time Control) which decreases the sensitivity of the receiver immediately after a radar pulse is transmitted, and progressively in- creases the sensitivity as the range increases.

If the control is set too low, targets will be hidden in the clutter, while if it is set too high, both sea clutter and targets will disappear from the dis- play. In most cases adjust the control until clutter has disappeared to leeward, but a little is still vis- ible windward.

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