Radar Display Overview - Raymarine a Series Installation And Operation Instructions Manual

18.3 Radar display overview

With your radar scanner connected and the radar in transmit
mode, the radar picture provides a map-like representation of
the area in which the radar is operating.
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Item Description
1 Range
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On-screen controls (Touchscreen multifunction displays
only.)
3 Gain mode
4 Ship's Heading Marker (SHM)
5 Orientation
6 Guard Zone
7 Motion mode
8 Range status
9 Range ring spacing
10 Data cell overlay
11 Waypoint
12 Safe zone ring
13 Range out (Touchscreen multifunction displays only.)
14 Range in (Touchscreen multifunction displays only.)
15 Ship's position
Note: On-screen range controls can be enabled and disabled
from the homescreen: Customize > Display Preferences >
Range Controls
Additional functionality of the radar application includes:
• Color palettes.
• Adding AIS overlay.
• MARPA targets.
• VRM/EBL markers
Typically, your vessel's position is at the center of the display,
and its dead ahead bearing is indicated by a vertical heading
line, known as the Ship's Heading Marker (SHM).
Note: If the cursor is placed over the SHM, the SHM will
temporarily be removed to help placing markers or acquiring
targets etc.
On-screen targets may be large, small, bright or faint, depending
on the size of the object, its orientation and surface. If using
a non-HD digital radome scanner, strongest target returns are
displayed in yellow with weaker returns in 2 shades of blue. If
using a HD or SuperHD radar scanner, stronger target returns
show as different colors from a range of 256 colors, providing
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better clarity. Be aware that the size of a target on screen
is dependent on many factors and may not necessarily be
proportional to its physical size. Nearby objects may appear to
be the same size as distant larger objects.
Note: Colors stated above refer to the default color palette.
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With experience, the approximate size of different objects can
be determined by the relative size and brightness of the echoes.
You should bear in mind that the size of each on-screen target
is affected by:
• The physical size of the reflecting object.
• The material from which the object is made. Metallic surfaces
reflect signals better than non-metallic surfaces.
• Vertical objects such as cliffs reflect signals better than sloping
objects such as sandbanks.
• High coastlines and mountainous coastal regions can be
observed at longer radar ranges. Therefore, the first sight
of land may be a mountain several miles inland from the
coastline. Although the coastline may be much nearer, it may
not appear on the radar until the vessel is closer to shore.
• Some targets, such as buoys and small vessels difficult
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to discern, because they do not present a consistent
reflecting surface as they bob and toss about in the waves.
Consequently these echoes tend to fade and brighten, and at
times disappear momentarily.
• Buoys and small vessels resemble each other, but vessels
can often be distinguished by their motion.
Note: A GPS receiver and a fast heading sensor are required
for MARPA operation, and to enable radar/chart overlay.
Radar context menu
The radar application includes a context menu which provides
positional data and menu items.
The context menu provides the following positional data for the
cursor location in relation to your vessel:
• Latitude
• Longitude
• Range
• Bearing
The context menu also provide the following menu items:
• Acquire Target
• Place VRM/EBL
• Place Waypoint At Cursor
• Slew thermal camera (Only available when thermal camera
is connected and operating.)
Accessing the context menu
You can access the context menu by following the steps below.
1. Non-touchscreen and HybridTouch displays:
i. Selecting a location, object or target on-screen and
pressing the Ok button.
2. HybridTouch and Touch only displays:
i. Selecting an object or target on-screen.
ii. Selecting and holding on a location on-screen.
a Series / c Series / e Series