Raymarine C140w User Reference Handbook page 111

Tuning method Related options
Enhance Echoes INT. REJECTION:
functions:
• ON — minimizes
• Interference
the effect of
rejection — this interference from
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
target returns, making
• Wakes — enables
them easier to see.
you to see the
However, larger
direction and speed
returns may decrease
of moving targets
target resolution, and
relative to your
merge on the display.
vessel.
• 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
Using radar
Description Tuning method
The enhance echoes
functions enable you to
minimize the negative
effects of echoes on the
radar display.
Tune control
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.
• AUTO — the The radar tuning control
default mode. enables you to fine-tune
the radar scanner's
The radar tunes
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,
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