Furuno 1715 manual Heading Line, Interference Rejector, User menu description, Description

1. OPERATION

User menu description
Item	Description
TX/ST-BY	Sets radar in transmit or
	stand-by status. (Same
	functions as the [MODE] key.)
INT	Rejects radar interference.
REJECTION
ECHO	Stretches echoes in range
STRETCH	direction or range and bearing
	direction.
FTC	Suppresses long-range rain
	clutter.
NOISE	Rejects noise.
REJECTION
WATCHMAN	Periodically checks for targets
TIME	in guard zone.
HDG LINE	Temporarily turns the heading
OFF	line off.
ECHO TRAIL	Shows echo movement in
	afterglow.
TRAIL	Adjusts echo trail brilliance.
BRILLIANCE
SYSTEM	Opens the system menu. For
MENU	description see paragraph
	1.30.

1.15 Heading Line

The heading line indicates the ship’s heading and it is the solid line which appears at zero degrees on the bearing scale.

To temporarily erase the heading line to look at targets existing dead ahead of own ship, do the following:

1.Press the [MENU/ESC] key to open the User menu.

2.Press ▲ or ▼ to choose HDG LINE OFF from page 2.

3.Press ► to turn the heading line off. The line stays off while ► is pressed.

4.Press the [MENU/ESC] key to close the menu.

1.16 Interference Rejector

Mutual radar interference may occur in the vicinity of another shipborne radar operating in the same frequency band (9 GHz). It is seen on the screen as a number of bright spikes either in irregular patterns or in the form of usually curved spoke-like dotted lines extending from the center to the edge of the picture. This type of interference can be reduced by activating the interference rejector circuit. “IR” and the rejection level indicator “L,” “M” or “H” appear at the top right corner when the interference rejector circuit is on.

Appearance of interference

Turn off the interference rejector when no interference exists, to avoid missing small targets.

1.Press the [MENU/ESC] key to open the User menu.

2.Press ▲ or ▼ to choose INT REJECTION from page 1.

3.Press ► to open the options window.

4.Press ▲ or ▼ to choose OFF, LOW, MEDIUM or HIGH as appropriate.

5.Press the [MENU/ESC] key to finish.

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