NAVMAN
8120/8084
Installation and Operation Manual
79
Use the interference rejection option to
reduce both the interference patterns and
the width of the interference lines.
There are four choices:
• Off. Interference rejection is off.
• Low operates the interference rejection at
minimum strength.
• Medium operates the interference
rejection at medium strength.
• High operates the interference rejection at
maximum strength. This setting can make
it more difficult to detect some targets
and radar beacons. Use this setting only
when necessary.
Palette
Select the color scheme for the radar window.
Digit size
The range of the radar is shown on the radar
window; for example 1/16. You can show this
information in small, medium or large digits.
Range ring
The range rings and compass ring help you to
quickly estimate the range and bearing of a
target from your boat.
The range ring and compass ring are
shown. The number of range rings and
the spacing interval between them is set
automatically according to the range setting.
The current spacing interval is shown in the
top left corner of the radar window.
Range ring and compass ring are hidden.
North line
Whatever the radar windorotation, you can
always show the blue North line.
If the bearing mode is set to:
• magnetic, the North line always points to
magnetic North.
• true, the North line always points to true
North.
Show the North line.
Hide the North line.
You can easily compare the visual view in
front of your boat with the radar screen.
• Course up works only when COG data or
heading data from a heading sensor is
available and there is an active route. It
means that your desired heading is always
pointing to the top of the radar screen
so that you can compare the leg bearing
of the active route with the radar screen.
(If you’re in Course up rotation but don’t
have an active route, the radar uses Head
up rotation until a route is made active.)
Motion mode
True motion mode is not available if there
is no position data, and no heading or
COG data. However, you are strongly
recommended to use a good quality product
(such as a NAVMAN HS02, HS03 or Autopilot)
to provide heading data.
There are two choices:
• Relative (RM). Your boat remains in a fixed
location on the radar screen and all other
objects move relative to your position.
(You can choose the position of the fixed
location, see Section 18-10). RM is the
default.
• True (TM). Your boat, and moving targets,
move across the radar screen as you travel.
All stationary objects remain in a fixed
position. You must have position data, and
heading or COG data for this option to be
available.
Interference filter
If the radar on another boat is operating
at the same frequency as your radar, it can
cause interference patterns on the radar
window.
Interference patterns always appear in a
different place with each sweep. They can
be randomly scattered bright dots or dotted
lines that extend from the centre to the
edge of the radar window, often producing
a spiral pattern. Generally, the stronger the
interference, the wider the interference lines.
