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Chapter 14: RayTech advanced features 149
Downwind plot
The downwind plot screen calculates the best angle and boat speed when
sailing downwind and displays:
• VMG relative to Twa.
Click
Vmg
to view, then select the Tws range to plot by clicking on the
Tws (kts)
up/down arrows or by entering the numbers directly.
• Boat speed relative to Tws.
Click
Bsp
to view.
• Twa relative to Tws.
Click
Twa
to view.
Vmc plot
The Vmc plot screen displays the Velocity Made good on Course towards a
specific mark or target. Although similar in concept to VMG, Vmc is equal
to VMG only when the bearing to the mark and wind direction are iden-
tical. Vmc is used when you expect the wind to change between your
present position and the target (primarily in long course racing).
In such an instance, it may be a smarter tactical move to sail toward your
target at the fastest possible speed, even if that heading isn’t directly
toward the target.
To use the Vmc plot, select the Course and true wind direction to be plotted
by clicking on the Course, Twd and Tws (kts) up/down arrows or entering
the numbers directly.
By default, course and Twd are initially derived from instrument input, but
the screen allows you to change these figures to calculate what happens if
the wind or course changes.
Instrument calibration for accurate data
The accuracy of data generated by your instruments and performance eval-
uation depends on accurate calibration. This section gives an introductory
explanation of instrument calibration, you must refer to the Manufacturer’s
manuals that came with your instruments for specific calibration proce-
dures. The following calibration principles are explained:
•Boat speed.
•Compass.
• Apparent wind angle.
• True wind angle.
• True wind speed.
Boat speed
Boat speed calibrations are entered directly into your instrumentation
system. While it may not be practical to check boat speed calibration on a
daily basis, you are encouraged to check this variable on a measured mile
as often as possible, as the paddle wheel impellers used to generate boat
speed data can change their physical characteristics markedly over their life
span due to the environment in which they operate. When making a
measured mile calibration, perform three consecutive runs over the known
distance, to eliminate any tidal current effects.
Compass
Compass calibration involves two procedures: deviation and heading error
calibration.
Calibrating deviation corrects compass error around different points of the
compass. Keep in mind that some instrument systems have the ability to
calibrate the compass automatically.
- Raytech RNS V6.2 1
- User’s Guide 1
- Important information 11
- About this manual 12
- Conventions used 13
- Product use 13
- System integration 13
- Technical accuracy 13
- Copyright 14
- 1.1 Introduction 15
- 1.3 System overview 16
- 1.4 System features 16
- Navionics Platinum chart card 17
- Sailboat racing 17
- 2.1 Introduction 19
- 2.2 System requirements 19
- 2.3 Compatible displays 19
- Driver update 20
- Version number 21
- Display adapter details 21
- Chapter 3: Getting started 23
- 3.3 Starting to use RayTech 24
- License keys 25
- Configure network settings 27
- 3.5 Setting up RayTech 29
- RayTech Tools 31
- Network Config 32
- What’s connected 33
- 3.7 Installing charts 34
- Maptech cartography 35
- Navionics cartography 35
- RayTech chart installer 35
- Install 36
- 4.1 Introduction 37
- 4.2 The screen 37
- 4.3 Interface controls 37
- Drop down menus 38
- Toolbars 38
- Softkeys 38
- Right mouse menus 38
- 4.4 Displaying information 39
- Action box 40
- Data box 40
- Application information box 40
- Moving around a split page 41
- RayTech default screen 42
- Chapter 5: Using charts 43
- 5.4 Moving around the chart 44
- 5.5 Choosing a chart type 44
- Chart layers 45
- Chart order 45
- Chart quilting 46
- Default chart screen 47
- 6.1 Introduction 49
- 6.2 New 2D chart features 50
- Pilot book 51
- 6.3 2D chart enhancements 52
- Search port by name 53
- Wrecks data 53
- Coastal roads 54
- US inland waterways 54
- 3D cartography screen 55
- The application 56
- The controls 56
- The operating modes 56
- Find Ship 57
- Changing your viewpoint 58
- Making the view clearer 58
- Planning mode 58
- Navigating with 3D Charts 59
- 7.1 Introduction 61
- 7.2 What is a waypoint? 61
- 7.3 Placing a waypoint 61
- Manage waypoint function 62
- 7.6 Navigating to a waypoint 64
- 7.7 Moving a waypoint 64
- 7.8 Edit waypoint details 65
- 7.9 Organizing waypoints 65
- 7.11 Waypoint recycle bin 66
- 8.1 Introduction 71
- 8.2 What is a route? 71
- 8.3 Creating a route 71
- Add a waypoint to a route 72
- Deleting a waypoint 73
- 8.4 Monitoring the course 74
- Restart XTE 75
- Next Leg and Previous Leg 75
- CDI monitor 76
- 9.1 Introduction 77
- 9.2 Tides 78
- 9.3 Currents 79
- Tides and Currents screens 80
- 10.1 Introduction 81
- 10.3 The radar picture 81
- Head - up (H-UP) 82
- North - up (N-UP) 82
- Course - up (C-UP) 82
- Sea mode 83
- 10.6 Making targets clearer 84
- Changing the displayed range 85
- Range rings 85
- VRMs/EBLs 86
- 10.10 MARPA 88
- Target and vector history 89
- Target history 90
- Viewing MARPA target data 91
- RayTech Radar screen 92
- 11.1 Radar setup 93
- Sea clutter curve 94
- Antenna size 94
- Image quality 96
- True echo 97
- Rain or snow clutter 98
- Mutual radar interference 98
- Your position 99
- Operation modes 99
- Other vessels or objects 99
- Orientation 100
- True north at top 101
- SHM rotates accordingly 101
- Setting the motion mode 102
- Gain presets 103
- 11.8 Super HD adjustments 104
- Interference rejection 105
- Expansion 105
- Power boost 105
- 11.10 Radar range 106
- Bearing and range from 107
- Electronic Bearing Marker 108
- Combined range and bearing 109
- Floating VRM and EBL 109
- Guard zones 110
- To acquire a target 112
- MARPA targets 113
- Dangerous target 114
- Safe target 114
- Target being acquired 114
- Lost target 114
- 12.1 Introduction 115
- 12.2 What is AIS? 115
- 12.4 AIS baud rate selection 116
- (Default in bold) 117
- 00h04m33s 118
- D10758_1 119
- MARPA and AIS options 120
- 12.7 AIS Alarms 121
- 12.8 AIS Layer Setup Menu 121
- 13.1 Introduction 123
- 13.2 The sonar screen 123
- 13.3 Presets 124
- 13.4 Changing the screen view 124
- Target depth ID 125
- Changing the range 126
- Gain mode 127
- Color gain mode 127
- Color Threshold 128
- Bottom lock 129
- Select View 130
- Bottom Lock 130
- A- Scope 131
- A-Scope is displayed 132
- White line 133
- Sonar mark 134
- Getting a closer view 135
- 136
- Distance-behind-boat 137
- 13.12 Sonar alarms 138
- Fish alarm 139
- Playback File Name 140
- Default Sonar Screen 141
- 14.1 Introduction 143
- 14.2 Weather information 143
- Configuring the Weather Layer 144
- Animating weather files 145
- RayTech Weather screen 146
- Distance and 148
- Modifying a databox 149
- Re-ordering channels 150
- Creating a databox 151
- Modifying a channel 151
- Using the font selector 151
- Font style 152
- 14.5 Polar plotting 153
- Data test 155
- Tws (kts)) 158
- Boat speed 159
- 14.6 DataTrak 160
- Adding wands 162
- 14.7 Pre-start display 163
- Set Port End 164
- Set Starb End 164
- Pre-start display 165
- 14.8 Route optimization 166
- Optimum route 167
- Navigation numbers 168
- 14.9 Navigation numbers 169
- 14.10 Engine panel 170
- Chapter 15: Using video 173
- Presentation/Set Up 174
- RayTech video capture 175
- 16.1 Introduction 177
- 16.2 Technical support 187
- Appendix A: Charts 189
- Waypoints 190
- Appendix B: Radar 191
- B. 3 Range control 192
- Side lobes 194
- Indirect echoes 194
- Multiple echoes 194
- Sea clutter 195
- Rain clutter 195
- Interference 196
- Appendix C: Sonar 197
- C.4 Displaying targets 198
- C.6 Range and shift values 198
- Suppression Ferrites 201
- D.2 System integration 202
- NMEA basics 203
- RS-232 basics 203
- D.4 Circuit grounding issues 204
- D.5 Cables and cable runs 204
- D.6 Proper cable shielding 204
- D.8 Interfacing RayTech 205
- D11905_1 207
- Figure D-2: SeaTalk 208
- Crossover Coupler 208
- SeaTalk devices 209
- Mounting the interface box 209
- GO TO WPT 210
- Appendix E: Toolbars 211
- Waypoint menu 212
- Route menu 212
- Tools menu 213
- View menu 214
- Help menu 215
- Window menu 215
- Standard toolbar 216
- Routes and waypoints toolbar 217
- Charting toolbar 217
- Animation toolbar 218
- Alarms toolbar 219
- Tides/Currents toolbar 219
- 3D toolbar 220
- Yacht racing toolbar 221
- Pre-start toolbar 222
- Weather toolbar 222
- Databox toolbar 223
- Appendix G: Glossary of terms 227
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