Virtual image, Shadow sectors | Furuno 1933, 1943, 1833 specification

2. RADAR OPERATION

Virtual image

A relatively large target close to your ship may show at two positions on the screen. One of them is the true echo directly reflected by the target and the other is a false echo which is caused by the mirror effect of a large object on or close to your ship as shown in the figure below. If your ship comes close to a large metal bridge, for example, such a false echo may temporarily be seen on the screen.

Target ship

Own ship

True echo

Mirror image	False
of target ship	echo

Virtual image

Shadow sectors

Funnels, stacks, masts, or derricks in the path of the antenna block the radar beam. If the angle subtended at the antenna is more than a few degrees, a non-detecting sector or blind spot may be produced. Within this sector, targets can not be detected.

Radar antenna

Radar mast

Shadow sector

Shadow sectors

2-48

Image 82

Furuno 1933, 1943, 1833 manual Virtual image, Shadow sectors

Contents

Marine Radar 00080918601 Do not disassemble or modify the equipment Furuno agent or dealer about replacementDo not open the equipment Keep heater away from equipment Table of Contents Iii 11.6 Plotter Operation Video Sounder Operation Customizing Your Unit MAINTENANCE, Troubleshooting Vii Word to the Owner of the Model 1833/1933/1943 Marine Radar Viii Features NavNet system NavNet system Two-unit NavNet system Two-unit NavNet systemThree-or-more-unit NavNet system What is WAAS? Xii Operational Overview Overview of display unit controls Operating ControlsDisplay unit controls Control panel Display unit Soft keysRadar display Numerics Enter knob Alphabet, symbol, numericEnter knob Trackball Remote controller Remote controller Chart card and card remover Inserting a Chart CardDisplay unit Turning the Unit On/Off Startup sequence Display brilliance, panel brilliance Brilliance adjustment soft keysDisplay brilliance and panel brilliance windows Economy mode Brilliance boost Display screens Selecting a DisplayDisplay modes Screen type and available display screen Display screen selection window Selecting a displayRadar combination screen selection window Switching control in combination screens Select source menu Selecting image sourceRadar source and sounder source windows Trackball, Cursor Cursor, cursor data MOB concept Entering the MOB Mark, Setting MOB as DestinationMOB mark messages Rearranging data boxes Data BoxesShowing, hiding data boxes with soft key Temporarily erasing a data box Executing a function Function KeysFunction keys Radar Simulation setup menuSimulation Display NavNet display unit-generated echoes NavNet radar antenna-generated echoes Plotter Sounder Radar Operation Radar Display Tuning window TuningAdjusting the Gain Transmitting, Stand-by Gain adjustment soft keys Gain sensitivity window Reducing Sea Clutter Adjusting the A/C SEASEA setting window How the A/C SEA works Rain setting window Adjusting the A/C RainReducing Precipitation Clutter Range scales nm, sm Range ScaleRange scales km Signal process soft keys Pulselength Selecting a presentation mode Presentation ModeRadar display soft keys Description of presentation modes Head-up presentation modeCourse-up presentation mode Head-up H-UP North-up N-UP North-up presentation modeTrue motion presentation mode True motion TR-M Measuring the Range Measuring range by range rings How to measure range to a target with the cursor Measuring range by cursor Measuring range by VRM How to measure range with the VRMEBL/VRM soft keys Hiding EBL/VRM data boxes Erasing a VRM, VRM indicationErasing EBL/VRM data boxes Moving EBL/VRM data boxes Measuring bearing by cursor How to measure bearing with the EBLMeasuring the Bearing Measuring bearing by EBL Erasing the Heading Line, North Marker Erasing an EBL, EBL indication Reducing Noise Interference Rejecting Radar Interference Radar interference Zooming in on ARP, TTM targets ZoomZooming in on radar targets Zoom Target no. selection window Shifting the PictureManual shift Shifting the picture manually Automatic shift Setting automatic shift maximum speedAuto ship speed setting window Automatic shift Predicting collision course Using the Offset EBLPredicting collision course with the offset EBL Measuring range & bearing between two targets Measuring range and bearing between two targets Sample echo trails Echo TrailsTrail time Trail soft keys Trail gradation Starting echo trailsMultitone and monotone trails Echo trail mode Trail mode window Echo Stretch Types of echo stretch Echo Averaging Effect of echo averaging Outputting TLL Data Target soft keys Setting a guard alarm zone Guard AlarmHow to set a guard alarm zone When the alarm is violated… Cancelling the guard alarm How watchman works Setting watchman stand-by intervalWatchman Turning on/off watchman Suppressing Second-trace Echoes Second-trace echoes Waypoint Marker Waypoint marker 26 ARP, TTM Operation Display accuracy is affected by the following Activating/deactivating ARP, TTM ARP setup menuARP target info window Manual acquisition ARP plot symbolsAcquiring and tracking targets ARP Automatic acquisition Automatic acquisition area Displaying target number ARP, TTMARP target number Terminating tracking of selected targets Cancel all targets windowTerminating tracking of ARP targets Terminating tracking of all targets What is a vector? Setting vector attributes ARPVector reference, vector time Past position displays Displaying past position ARPPlot interval window 26.7 ARP, TTM target data ARP target data 26.8 CPA/TCPA alarm ARP CPA window Tcpa window Lost target alarm ARPCanceling a lost target Lost target mark General Interpreting the Radar DisplayMinimum and maximum ranges Range resolution Radar resolutionBearing resolution Bearing accuracy Multiple echoes False echoesMultiple echoes Sidelobe echoes Shadow sectors Virtual imageVirtual image Shadow sectors Appearance of Sart signal on the radar display Sart Search and Rescue Transponder General procedure for detecting Sart response General remarks on receiving Sart SEA control Appearance of racon signal on the radar displayRacon Radar Beacon Rain control This page is intentionally left blank Full-screen plotter display Plotter DisplaysFull-screen plotter display Nav data window Contents of nav data window001WPT Compass display Compass display XTE range setting window Reading the XTE cross-track error monitorSetting the range for the XTE monitor Soft keys Highway display Highway display Nav data display Nav data displays Plotter display, north-up mode North-up Plotter display, course-up mode, destination set Course-upAuto course-up Auto course-up display Charts scales Chart ScaleShifting the Display Indices and chart enlargement Chart CardsChart card overview Chart icons and their meanings Chart symbols Furuno and NavCharts chartsWhen a chart cannot be displayed Chart symbols Lighthouse mark Data for aids to navigationExample of buoy, lighthouse data Port service icons NavCharts only Plotter display, showing port service display Objects window MAP chartsCursor and data display Example of caution area window Lighthouse icon Icon dataObject windows Tide information Sample lighthouse dataObjects window Tide window Date window Own ship track Working with TrackDisplaying track Track control menu Stopping, restarting plotting of own ship track Target track Interval window Track plotting method and interval for own ship trackTrack plotting method Track plotting interval Changing own ship track/mark distribution setting Track memory window Erasing own ship track by area Erasing trackErase menu Erasing all own ship track Erasing all target tracks Changing mark attributes Marks, LinesEntering a mark, line Mark shapes Selecting line type Marks shape window Erasing an individual mark Erasing marks, linesLines style window Erasing an individual line Erasing all marks, lines Entering a waypoint at own ship position WaypointsEntering waypoints Entering a waypoint with the cursor Select Mark Waypoint ark shape selection window Entering a waypoint by range and bearing Alphanumeric and local waypoint lists Editing waypoint dataEntering a waypoint from the waypoint list Editing waypoint data from the waypoint list Editing a waypoint from the plotter display Plotter display Erasing a waypoint from the menu Erasing waypointsErasing a waypoint directly from the plotter display Erasing a waypoint from the waypoint list Changing waypoint mark size FURUNO, NavCharts Chart details menu Searching waypoints Alphanumeric list Entering a route with existing waypoints RoutesCreating routes Route menu Entering a route with the cursor Save route menu Creating voyage-based routesSave route window For manual entry of waypoints, do the following Displays for entry of time, distance intervalTo stop recording waypoints and save the route Connecting routes Connect route window Edit route menu Inserting a waypoint in a routeInserting a waypoint from the route list Waypoint list for editing a route local list Inserting a waypoint from the plotter display Inserting a waypoint in an intermediate location on a route Removing a waypoint from the route list Removing waypoints from a routeErasing routes Removing a waypoint from the plotter display Selecting quick point entry method NavigationNavigating to a quick point Go to method window Selecting a waypoint from the plotter display Navigating to waypointsNavigating to multiple quick points Selecting a waypoint from the waypoint list Navigating to ports, port services NavCharts only Port services and sample port list Sample filling station locations southern Italy Plotter display, route selected as destination Following a routeSelecting the route to follow Navigating waypoints in reverse order Restarting navigation Example of when to restart navigationLog display Automatic waypoint switching methods Setting speed for ETA calculationSwitching waypoints Select speed for ETA window Cancelling route navigation Plotter alarm menu AlarmsAudio alarm on/off Audio alarm window How the arrival alarm works Arrival alarmArrival alarm window How the anchor watch alarm works Anchor watch alarmAnchor watch alarm window How the XTE alarm works XTE Cross-Track Error alarmSpeed alarm XTE alarm window Proximity alarm window Proximity alarmProximity mark Trip alarm Trip alarm window Alarm information Plotter alarm menu, Alarm messages Plotter alarm messages and their meanings Resetting Trip Distance General setup menu, Principle of Operation Underwater conditions and video sounder display Sounder Displays Display mode windowSelecting a sounder display Description of sounder displays 114Single-frequency display Sounding area and transmission frequency Dual-frequency displayDual-frequency display KHz picture Marker-zoom display Bottom-zoom display Marker-zoom display plus normal sounder displayBottom-zoom display plus normal sounder display Bottom discrimination display Bottom-lock displayBottom-lock display plus normal sounder display Bottom discrimination display Scope display display only Selecting screen split method in combination displaysScope display How the automatic sounder works How to enable automatic sounder operationAutomatic Sounder Operation Types of automatic sounder modes Manual Sounder Operation Selecting the manual modeAdjusting the gain Selecting display range Gain window Shifting the rangeShift concept How to measure depth and time Measuring Depth, Time Types of interference Reducing InterferenceNoise limiter window Appearance of clutter Reducing Low Level NoiseClutter window Erasing Weak Echoes Signal level windowAppearance of weak echoes Advancement independent of ship’s speed Picture Advance SpeedPicture advance window How the speed-dependent picture advance mode works Advancement synchronized with ship’s speed Sounder alarm menu Bottom alarm window Bottom alarmFish alarm Fish alarm window Fish alarm B/L Fish alarm B/L window Water temperature alarm Water temperature alarm window When an alarm setting is violated Depth Alarm Water Temperature Graph Sounder alarm messages and their meanings Bottom echo Interpreting the Sounder DisplayZero line Zero line Fish school echoes Fish school echoesSurface noise/Aeration Surface noise/aeration General Setup General setup menu Contents of general setup menu Con’t on next Contents of general setup menu con’t from previous Radar SetupRadar display setup Radar display setup menu Contents of radar display setup menu Radar range setup Radar range setup menu Radar function key Function key setupRadar function key options Radar function keys Menu Item Function Function Key Plotter setup menu Contents of plotter setup menu Plotter SetupNavigation options Plotter function key menu Function key setupFunction Default Function Key Key Label Plotter function key options Plotter function keys RUL Chart offset Chart SetupPlotter display, chart offset selected FURUNO, NavCharts chart attributes Chart details menu C-MAP MAP chart attributesContour line menu FURUNO, NavCharts Cntour Line soft key Contents of chart details menu C-MAP Depth Info soft key Depth info menu C-MAP Data Boxes Setup Data box menu Hot Page Setup Hot page setup screen, HOT Contents of nav setup menu Navigator SetupNavigation data source GPS receiver setup GPS setup menu Contents of GPS setup menu Contents of GPS setup menu con’t from previous Contents of GPS sensor settings menu con’t from previous Waas Setup Contents of Waas Setup menu Displaying Loran C TDs TD display setupTD setup menu Loran GRI & station pair window Displaying Decca TDs Decca chain and station pair window Nav data setup screen Nav Data Display SetupNav data setup window System setup Sounder SetupOn next Sounder system setup menu description con’t from previous TVG Sensor setup menu Sensor setupSensor setup menu settings Sounding range, zoom range, bottom lock range Sounder range setup menuDefault basic ranges Zoom range and bottom-lock ranges Sounder function key menu Sounder function key options Sounder function keys Formatting memory cards Memory Card OperationsSave data menu Saving data to a memory card Memory card messages Memory card messages Playing back data from a memory card Load data menu Uploading or downloading data Setting communication software on the PCUploading, Downloading Data Upload and download menus Waypoint data format Baud rate windowWaypoint data format Characters available for comment Route comment data format Route data menuEnd of sentence Loading Waypoint Data from Yeoman Host name window Receiving Data Via Network EquipmentReceive data menu Marks & lines window Outputting Data Through the Network Select sentence menu Replacement of Battery Preventive MaintenanceMaintenance program Replacement of Fuse Trackball Maintenance Radar troubleshooting Simple TroubleshootingGeneral troubleshooting Radar Plotter troubleshooting Plotter Sounder troubleshooting Sounder Diagnostics Memory I/O test GPS sensor test Requires GPS Receiver GP-310B/320B Display unit testDisplay unit test results GPS receiver test results Network sounder test results Network sounder test Requires Network Sounder ETR-6/10NARP test results Test pattern Test patterns Keyboard, remote controller test Screen for testing keyboard, remote controller GPS Status Display GPS status display Memory clear menu Clearing MemoriesWindows for clearing memory Error Messages Error messages This page is intentionally left blank Menu Overview Menu key Appendix LAT/LON Format DD MM. MM’ DD MM. MMM’ DD MM. MMMM’ 4800 Plotter Chart Border Line ON, OFF Speed 010.0 kt 0-999.9 kt Temperature Graph ON, OFF Plotter Alarms Alarm keyRadar Alarms Sounder Alarms Geodetic Chart List World Time Chart Icons V E Specifications of Marine Radar Model 1833/1933/1943 E3502S01D Plotter Function Coating Color Index Index-1 Index-2 Index Index-3 Messages Presentation mode Index-4 Index-5 Waypoints