Raymarine gS Series, Инструкция по установке и эксплуатации, Страница: 125 / 208

Vessel vectors (CPA graphics) overview
CPA graphics show vectors for your vessel and a selected target.
A vector is a line on-screen showing the predicted courses of
your vessel and the selected target if you both remain on your
present course. These vectors vary in length due to vessel
speed and vector length set in the MARPA Set-up menu.
0 .556nm
00h30m09s
1 43°T
28.0kt
1 2
D 9008-2
Item Description
1 Target vector
2 CPA graphic
True motion
With the display set in true motion mode, the vectors of your
vessel and the target are shown extended to their intersection
point. The CPA is shown as a line that is placed on your vessel’s
vector at the point of the CPA. The length and direction of the
line indicates the distance and bearing of the target at CPA. The
text indicates CPA and TCPA. The text next to the target symbol
indicates its true course and speed.
Relative motion
With the display set in relative motion mode, no vector extension
of your vessel is shown. The CPA line emerges from your own
vessel, with the target vector extension being shown as relative,
not true. The text next to the target indicates its course and
speed.
Displaying MARPA target data
1. Select the target.
The MARPA context menu is displayed which provides the
following data:
• Closest Point of Approach (CPA).
• Time to Closest Point of Approach (TCPA).
• COG (if available).
• SOG (if available).
2. To display CPA graphics select CPA Graphic from the
context menu:
i.
Select Auto to display the CPA graphic when the target
is selected.
ii. Select On to display the CPA graphic while the target is
being tracked.
iii. Select Off to hide the CPA graphic.
3. To display course and bearing information alongside to the
target select MARPA Data so that Show is highlighted.
i. Selecting MARPA Data will switch between Show and
Hide.
Viewing full MARPA target information
From the radar application:
1. Select Menu .
2. Select Targets .
3. Select View Target Lists .
4. Select View MARPA List .
5. Select the relevant target.
6. Select View Full Target Data .
18.6 Distances, range, and bearing
When you are using the radar application, you can measure
distances, ranges and bearings in a variety of ways.
These options are detailed in the table below:
Functions
Distances
Between
Points
Range From
Your Vessel
Bearings
Range Rings Yes
(approximate
distance) Yes
(approximate
range) No
Cursor No Yes Yes
Variable Range
Markers /
Electronic
Bearing Lines
(VRM/EBL) No Yes Yes
Floating
VRM/EBL Yes No Yes
Measuring using the range rings
Use the range rings to gauge the approximate distances
between points. Range rings are concentric circles displayed on
the screen and centred from your vessel at pre-set distances.
The number and spacing of the rings changes as you range
in and out.
Examples:
D 12214-1 D 12215-1 D 12216-1
Range — 1/4 nm
Range Rings — 760ft
apart Range — 3/4 nm
Range Rings — 1/4
nm apart Range — 1 1/2 nm
Range Rings — 1/4
nm apart
Measuring using the cursor
To measure the bearing and range from your vessel to a
specified target, move the cursor to the appropriate position
on the screen and press
Ok , the radar context menu will be
displayed which shall provide:
• Latitude
• Longitude
• Range
• Bearing
D12217-2
1 2
Item Description
1.
Cursor
2. Bearing and range from your vessel
to the cursor position
You can also display the cursor position in the databar, from
the homescreen select:
Customize > Databar Set-up > Edit
Databar , now select the data box where you want the cursor
position to be displayed. Select Navigation > Cursor Position .
Radar application
211