User manual - JG Technologies

• 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.
12.6 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 digital radar scanners.
Using your multifunction display and an HD digital 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.
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.
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.
The radar context menu can be accessed by:
• Selecting a location using the Joystick and pressing the Ok
button, or
• Selecting and holding on an area on screen — Hybridtouch
multifunction displays only.
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
The menu items can be accessed:
• using the Rotary Control and Ok button, or
• selecting the menu item on screen — Hybridtouch multifunction
displays only.
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
4 Kw HD Digital
Open Array
4 Kw SuperHD
Digital Open
Array
12 Kw HD Digital
Open Array
12 Kw SuperHD
Digital Open
Array
HD Digital
Radome
Dual range
mode
*Range covered
by software
versions 1.xx
to 2.xx
Range covered
by software
versions 3.xx
onwards
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
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
Long (1) n/a 1/8 nm to 72 nm
Short (2) n/a 1/8 nm to 72 nm
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
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.
130 e7 / e7D / e95 / e97 / e125 / e127 / c95 / c97 / c125 / c127