Raymarine Pathfinder User Manual Page 48
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Chapter 10: Working with radar 85
(COG). The better the quality of the heading data, the better MARPA will
perform. MARPA will function without SOG and COG data, but only rela-
tive vector, CPA and TCPA are shown; target course and speed cannot be
calculated.
Risk assessment
Each target is displayed as a symbol to indicate its status:
Each target is monitored to determine if it will be within a certain distance
from your own boat within a certain time. If so, the target is designated as
dangerous, and you are notified with an audible alarm and a flashing on-
screen ‘MARPA target (ID No.) Dangerous’ warning. Press any key to
cancel the alarm and remove the warning; however, the target is
dangerous symbol remains displayed. Both the distance (Own Vessel Safe
Zone) and the time (Time to Safe Zone) are selectable.
If a target is lost, it is either because the MARPA software has lost contact
with it, or it has moved out of range. If this occurs, you are notified with an
audible alarm and an on-screen ‘MARPA target (ID No.) lost’ warning.
Press any key to silence the alarm and remove the message and lost target
symbol from the screen.
MARPA range
MARPA target acquisition is only available at radar range scales of up to 12
nm, although tracking continues at all ranges.
If you change to a smaller range scale, targets may be beyond the range of
your scanner and will be lost. In such cases, an on-screen warning will indi-
cate that the target is off-screen.
Target and vector history
You can display MARPA targets with a vector line showing where they will
be at a certain time in the future (assuming their present course and speed
remains unchanged). You can select a relative or true vector, and the
vector length.
Relative vector
A relative vector indicates the target’s motion relative to your own boat’s
motion. The target’s relative course and sped are calculated to produce a
vector that is displayed on the target only. Relative vector mode is used for
collision avoidance and threat assessment.
True vector
A true vector indicates the targets motion over ground. In this mode, true
vectors for the target and your own boat are displayed. MARPA measures
Target is being acquired
Target is safe
Target is dangerous
Target is lost
86 RayTech RNS V6.0 - Users Guide
the direction in which the target and your own boat are moving over the
ground. The result is the boat’s true course and speed. Consider this
motion as if you were in a helicopter looking down watching the targets
move across the water. This mode is used as an aid to navigation.
Target history
You can also view a target’s history, which appears as a trail of dots left by
the target as it travels. You can change the display interval of these dots.
To set up target vectors and history:
1. Click
Target Tracking
.
2. Click
Marpa Options
. The Marpa options dialog box is displayed.
3. Click the action boxes to set mode and distance as required.
4. Use the BACK button to return to the top level softkeys.
MARPA targets
Acquiring MARPA targets
You can acquire up to ten targets, which are then automatically tracked by
the MARPA system. The are three ways in which a MARPA target can be
acquired.
To acquire a MARPA target:
Method 1
1. Click
Target Tracking
.
2. Click
Acquire Target
.
3. Move the cursor over the target you want to acquire and click.
The target acquired symbol will appear at the cursor’s position, and the
radar will search for a target in the location. If a target is present for several
scans, the radar locks on to it and the safe target symbol appears. The target
ID number appears at the safe target symbol. The own vessel safe zone is
also displayed.
4. Repeat Steps 1 through 3 for each target you want to acquire.
Method 2
1. Move the cursor over the target you want to acquire.
2. Right click to display the right-click menu.
3. Highlight and click
MARPA
. The target options are displayed.
4. Highlight and click
Acquire
.
5. The target acquired symbol will appear at the cursor’s position, and the
radar will search for a target in the location. If a target is present for
several scans, the radar locks on to it and the safe target symbol
appears. The target ID number appears at the safe target symbol. The
own vessel safe zone is also displayed.
6. Repeat Steps 1 through 4 for each target you want to acquire.
Method 3
Double-click a target on the radar screen.
Cancelling a MARPA target
There are two ways in which a MARPA target can be cancelled.
To cancel a MARPA target:
Method 1
1. Click
Cancel Target
.
2. Move the cursor over the target you want to cancel and click.
- 1
- Contents 3
- Important information 6
- Conventions used 7
- Product use 7
- System integration 7
- Technical accuracy 7
- Copyright 7
- 1.1 Introduction 8
- 1.3 System overview 8
- 1.4 System features 8
- 2.1 Introduction 10
- 2.2 System requirements 10
- Driver update 11
- Useful websites 12
- Chapter 3: Getting started 13
- Configure network settings 14
- Operating modes 15
- 3.5 Setting up RayTech 16
- Network Config 17
- 3.7 Installing charts 18
- RayTech chart installer 19
- 4.1 Introduction 20
- 4.2 The screen 20
- 4.3 Interface controls 20
- 4.4 Displaying information 21
- Application information box 22
- Moving around a split page 22
- Chapter 5: Using charts 24
- Chart layers 25
- Chart order 25
- Chart quilting 25
- 6.1 Introduction 27
- 6.2 New 2D chart features 27
- Pilot book 28
- Business services information 28
- Find nearest 28
- Search port by name 29
- Wrecks data 29
- Coastal roads 29
- US inland waterways 29
- The application 30
- The controls 30
- The operating modes 30
- Making the view clearer 31
- Navigating with 3D Charts 32
- 7.1 Introduction 33
- 7.2 What is a waypoint? 33
- 7.3 Placing a waypoint 33
- 7.6 Navigating to a waypoint 34
- 7.7 Moving a waypoint 34
- 7.8 Edit waypoint details 35
- 7.9 Organizing waypoints 35
- 7.11 Waypoint recycle bin 35
- 8.1 Introduction 38
- 8.2 What is a route? 38
- 8.3 Creating a route 38
- 8.4 Monitoring the course 39
- Currents 41
- 9.1 Introduction 42
- 9.2 Tides 42
- 9.3 Currents 43
- 10.1 Introduction 44
- 10.3 The radar picture 44
- 10.6 Making targets clearer? 45
- Changing the displayed range 46
- Range rings 46
- VRMs/EBLs 46
- 10.10 MARPA 47
- Target is being acquired 48
- Target is safe 48
- Target is dangerous 48
- Target is lost 48
- Viewing MARPA target data 49
- Default sonar screen 49
- 11.1 Introduction 50
- 11.2 The sonar screen 50
- 11.3 Changing the screen view 50
- Target depth ID 51
- Changing the range 51
- Gain mode 51
- Color gain mode 52
- A-Scope 53
- White line 54
- Sonar mark 54
- Getting a closer view 55
- 11.11 Sonar alarms 56
- RayTech video capture 58
- Chapter 12: Using video 59
- RayTech Weather screen 60
- 13.1 Introduction 61
- 13.2 Weather information 61
- Animating weather files 62
- Viewing a weather file 62
- Distance and 63
- Modifying a databox 64
- 13.5 Polar plotting 65
- Data collection 66
- Entering and editing data 66
- Data test 67
- Tws (kts)) 68
- 13.6 DataTrak 69
- Adding wands 70
- DataTrak 71
- Pre-start display 71
- 13.7 Pre-start display 72
- 13.8 Route optimization 72
- 13.9 Navigation numbers 73
- 13.10 Engine panel 74
- 14.1 Introduction 75
- 14.2 USB navigation keyboard 75
- 15.1 Introduction 77
- 15.2 Technical support 80
- Appendix A: Charts 81
- Appendix B: Radar 82
- Side lobes 83
- Indirect echoes 83
- Multiple echoes 83
- Sea clutter 84
- Rain clutter 84
- Interference 84
- Appendix C: Sonar 85
- D.2 System integration 87
- D.4 Circuit grounding issues 88
- D.5 Cables and cable runs 88
- D.6 Proper cable shielding 88
- D.8 Interfacing RayTech 89
- CANCELOK 90
- 9-pin cable 91
- Raymarine Direct SeaTalk 92
- GO TO WPT 92
- Connecting an hsb 93
- PCMCIA PC kit 93
- Fully integrated system 95
- Integrated system checks 95
- Fully integrated hsb 96
- Appendix E: Toolbars 97
- Tools menu 98
- Route menu 98
- View menu 98
- Standard toolbar 99
- Routes and waypoints toolbar 100
- Charting toolbar 100
- Animation toolbar 100
- Alarms toolbar 101
- Tides/Currents toolbar 101
- 3D toolbar 101
- Fishing toolbar 102
- Yacht racing toolbar 102
- Pre-start toolbar 102
- Weather toolbar 102
- Databox toolbar 103
- s 104
- Appendix G: Glossary of terms 105
- Circuit grounding 166 107
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