Raymarine a67, Installation And Operation Instructions Manual, Page: 165 / 330

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.
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
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. New e Series or New c Series:
i. Selecting a location, object or target on-screen and
pressing the
Ok button.
2. Touchscreen multifunction displays:
i. Selecting an object or target on-screen.
ii. Selecting and holding on a location on-screen.
16.6 Dual range radar operation
The Dual Range radar function enables you to view 2 ranges at
the same time in separate windows. The function is available
with SuperHD and HD radar scanners.
Using your multifunction display and an HD or SuperHD radar
scanner, you can view either a short or a long range image in
separate radar windows.
The default setting is Long, which provides a standard scanner
range.
Limitations
• Dual Range operation is not available if MARPA targets are
active.
• You cannot acquire MARPA targets if Dual Range is enabled.
• Radar/chart sync and radar/chart overlay are temporarily
disabled when Dual Range is enabled.
Dual range radar compatibility
The range covered by the short Dual Range option depends on
the radar scanner you are using, and the software version it is
using.
Scanner
Dual range
mode
*Range
covered by
software
versions 1.xx
to 2.xx
Range covered
by software
versions 3.xx
onwards
4 Kw HD Open
Array Long (1) 1/8 nm to 72 nm 1/8 nm to 72 nm
Short (2) 1/8 nm to 3 nm 1/8 nm to 72 nm
4 Kw SuperHD
Open Array Long (1) 1/8 nm to 72 nm 1/8 nm to 72 nm
Short (2) 1/8 nm to 3 nm 1/8 nm to 72 nm
12 Kw HD Open
Array Long (1) n/a 1/8 nm to 72 nm
Short (2) n/a 1/8 nm to 72 nm
12 Kw SuperHD
Open Array Long (1) 1/8 nm to 72 nm 1/8 nm to 72 nm
Short (2) 1/8 nm to 3 nm 1/8 nm to 72 nm
HD Radome
Long (1) 1/8 nm to 48 nm 1/8 nm to 48 nm
Short (2) 1/8 nm to 48 nm 1/8 nm to 48 nm
Limitations of software version 1.xx and 2.xx
• The value for the short range setting must be less than or
equal to the long range setting.
• With Dual Range On and a short range window active
Expansion control shall be disabled in the Enhance Echoes
menu.
Using Dual Range with SuperHD scanners
Dual range radar operation with SuperHD scanners.
When using the short Dual Range option, a SuperHD scanner
operates in HD mode only. When using the long Dual Range
option, a SuperHD radar operates in SuperHD mode.
Radar application
165