Lighthouse a125, Installation And Operation Instructions Manual

Page: 301 / 460

Cancelling a MARPA target using the menu
1. Select Menu .
2. Select Targets .
3. Select View Target Lists .
4. Select View MARPA List .
5. Select the relevant MARPA target from the list.
6. Select
Cancel Target or Cancel All Targets .
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 .
Radar application
301