Raymarine C140w, C90w manual Rejection this, Expansion, Auto

Tuning method		Related options		Description
Enhance Echoes		INT. REJECTION:		The enhance echoes
functions:		•	ON — minimizes	functions enable you to
•	Interference			minimize the negative
			the effect of	effects of echoes on the
	rejection — this		interference from	radar display.
	function minimizes		other radar-equipped
	the effect of		vessels.
	interference from	• OFF — allows you to
	other radar-eqipped
			detect the presence
	vessels.
			of other radars in the
•	Expansion —
			vicinity.
	enables you to	EXPANSION:
	override the default
	radar pulse length,	•	ON — increases
	providing larger target		the pulse length.
	returns.
			This provides larger
•	Wakes — enables		target returns, making
	you to see the		them easier to see.
	direction and speed		However, larger
	of moving targets		returns may decrease
	relative to your		target resolution, and
	vessel.		merge on the display.
		• OFF — this is the
			default setting. It
			provides better range
			resolution, giving
			you more defined
			(but smaller) target
			returns.

WAKES:

•ON — shows the direction and speed of moving targets

Tuning method Related options Description

relative to your vessel. Targets are displayed in yellow, turning to paler shades of blue as the signal diminishes. The options are: 10 sec, 30 sec, 1 min, 5 min, 10 min.

	• OFF — does NOT
		show the direction
		and speed of moving
		targets in relation to
		your vessel.
Tune control	•	AUTO — the	The radar tuning control
		default mode.	enables you to fine-tune
		The radar tunes	the radar scanner’s
		itself automatically	receiver for maximum
		on all range	target returns on the
		scales. Raymarine	display.
		recommends that
		you leave the tune
		function in AUTO
		mode to receive the
		maximum signal.
	•	MANUAL — enables
		you to manually set
		the tuning. Adjust
		the control to obtain
		the maximum signal
		strength. If you adjust
		the setting shortly
		after powering up
		the radar scanner,

Using radar 111