Raymarine E Series User Reference Handbook page 135

Tuning method
Sea gain presets:
• Harbor — this is the default mode. This setting
takes account of land clutter so that smaller
targets, like navigation buoys, are not lost.
• Coastal — accounts for the slightly higher levels
of sea clutter you might encounter out of harbor
and adjusts the radar display accordingly.
• Offshore — Automatically adjusts for high levels
of sea clutter.
Enhance Echoes functions:
• Interference rejection — this function minimizes
the effect of interference from other radar-eqipped
vessels.
• Expansion — enables you to override the default
radar pulse length, providing larger target returns.
• Wakes — enables you to see the direction and
speed of moving targets relative to your vessel.
Using radar
Related Options
• AUTO — the preset operates in automatic mode.
This is the default.
• MAN — allows you to manually adjust the intensity
of the sea gain, from 0 to 100%.
INT. REJECTION:
• ON — minimizes the effect of interference from
other radar-equipped vessels. There are two
settings — NORMAL, and HIGH.
• OFF — allows you to detect the presence of other
radars in the vicinity.
EXPANSION:
• ON — increases the pulse length, giving larger
target returns that are easier to see. However,
larger returns may decrease target resolution, and
merge on the display. There are two settings —
LOW and HIGH.
• OFF — this is the default setting. It provides better
range resolution,giving you more defined (but
smaller) target returns.
WAKES:
• ON — you can see the direction and speed of
moving targets relative to your vessel. Targets are
displayed in yellow, turning to paler shades of blue
Description
Enable you to quickly select pre-configured settings
to achieve the best picture in different situations.
Each of the gain presets has a gain function, which is
set to automatic mode by default. Raymarine strongly
recommends the use of these presets to achieve
optimum results. However, you can adjust this gain
manually if required.
The enhance echoes functions enable you to
minimize the negative effects of echoes on the radar
display.
135