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TABLE OF CONTENTS
FOREWORD ..............................................vi
A Word to the Owner of the Model
18x4C/19x4C Series Marine Radar, GD-1920C
Color Video Plotter....................................... vi
Features ...................................................... vi
Notice .........................................................vii
SYSTEM CONFIGURATIONS..................viii
1. OPERATIONAL OVERVIEW............... 1-1
1.1 Operating Controls.............................1-1
1.1.1
Display unit controls................1-1
1.1.2 Remote controller....................1-3
1.2 Inserting a Chart Card........................1-4
1.3 Turning the Unit On/Off ......................1-5
1.4 Display Brilliance, Panel Brilliance, Hue ..
.......................................................1-6
1.4.1
Display brilliance, panel brilliance.
...........................................1-6
1.4.2 Hue.........................................1-7
1.5 Selecting a Display.............................1-8
1.5.1
Display modes ........................1-8
1.5.2 Selecting a display ..................1-9
1.5.3 Switching control in combination
and overlay screens..............1-10
1.5.4 Selecting image source......... 1-11
1.6 Trackball, Cursor..............................1-12
1.7 Entering the MOB Mark, Setting MOB as
Destination.......................................1-13
1.8 Data Boxes......................................1-14
1.8.1
Showing, hiding data boxes with
soft key .................................1-14
1.8.2 Rearranging data boxes ........1-14
1.8.3 Temporarily erasing a data box.....
.........................................1-14
1.9 Function Keys..................................1-15
1.10 Simulation Display ...........................1-16
2. RADAR OPERATION ......................... 2-1
2.1 Radar Display ....................................2-1
2.2 Transmitting, Stand-by .......................2-1
2.3 Tuning................................................2-2
2.4 Adjusting the Gain..............................2-2
2.5 Reducing Sea Clutter.........................2-3
2.5.1
How the A/C SEA works..........2-3
2.5.2 Adjusting the A/C SEA.............2-4
2.6 Reducing Precipitation Clutter ............2-4
2.6.1
Adjusting the A/C RAIN...........2-4
2.7 Range Scale ......................................2-5
2.8 Pulselength........................................2-5
2.9 Presentation Mode.............................2-6
2.9.1
Selecting a presentation mode 2-6
2.9.2 Description of presentation modes
...........................................2-7
2.10 Measuring the Range.........................2-8
2.10.1
Measuring range by range rings ...
...........................................2-8
2.10.2 Measuring range by cursor......2-8
2.10.3 Measuring range by VRM........2-9
2.10.4 Various VRM operations ..........2-9
2.11 Measuring the Bearing.....................2-10
2.11.1
Measuring bearing by cursor .2-10
2.11.2 Measuring bearing by EBL ....2-10
2.11.3 Various EBL operations..........2-10
2.12 Erasing the Heading Line, North Marker..
..................................................... 2-11
2.13 Reducing Noise Interference............ 2-11
2.14 Rejecting Radar Interference............ 2-11
2.15 Zoom ...............................................2-12
2.15.1
Zooming radar targets ...........2-12
2.15.2 Zooming ARP, TTM targets....2-13
2.16 Shifting the Picture...........................2-14
2.16.1
Manual shift...........................2-14
2.16.2 Automatic shift.......................2-14
2.17 Using the Offset EBL........................2-15
2.17.1
Predicting collision course.....2-15
2.17.2 Measuring range & bearing
between two targets ..............2-16
2.18 Echo Trails.......................................2-17
2.18.1
Trail time...............................2-17
2.18.2 Starting echo trails.................2-18
2.18.3 Trail gradation .......................2-18
2.18.4 Trail color..............................2-18
2.18.5 Echo trail mode.....................2-19
2.19 Echo Stretch ....................................2-19
2.20 Echo Averaging................................2-20
2.21 Outputting TLL Data.........................2-21
2.22 Guard Alarm.....................................2-22
2.22.1
Setting a guard alarm zone....2-22
2.22.2 When the alarm is violated….2-23
2.22.3 Cancelling the guard alarm....2-23
2.23 Watchman........................................2-23
2.23.1
How watchman works............2-23
2.23.2 Turning on/off watchman.......2-23