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NAVMAN 8120/8084 Fuel, AIS, & Radar Addendum 13
Changing the echo expansion setting
If you have several small targets in view
and want to make them easier to see, use
the echo expansion option.
Note that the
resolution decreases as the target size
increases, so use this option only when target
detection and visibility is more important
that the quality of the display.
Turning the target trails on or off
If you turn the target trails on, each target
leaves a 30 second trail on the radar screen.
You cannot change the length of the target
trail.
If you turn the target trails off, the targets do
not leave trails.
Note that if the radar motion mode is set to
true, stationary targets won’t leave a trail.
If the radar motion mode is relative, any
target that is moving relative to your boat will
leave a trail.
To change the target trails setting:
From the radar window, press
then
set the
Target trails option to
(target trails are on) or
(target trails are
off).
Using the VRM/EBL
Use one, or both of the VRM/EBL (Variable
Range Markers/Electronic Bearing Lines) to
quickly find the precise range and bearing of
a target.
A VRM can be fixed or floating. Use the VRM
to find the range (distance) to the target.
• A fixed VRM is shown as a thin, dashed,
circle centred around your boat. Use this
to find the distance of a target from your
boat.
• You can move the centre of the VRM away
from your boat; for example, to measure
the distance between two islands. This is
called a floating VRM.
The EBL is shown as a thin, dashed line
extending from the centre of the VRM to the
edge of the radar window. Use the EBL to find
the bearing of the target.
1 From the radar window, press
then
select
VRM/EBL.
To change the echo expansion setting:
From the radar window, press
then
select
Echo Expansion. There are
three choices:
• Off. No echo expansion.
• 1. Targets expanded x 2.
• 2. Targets expanded x 3.