Furuno FR-8051 manual Starting echo trail, Canceling echo trail, Trail time, Trail reference

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True trails

Relative trails

Figure 1-21 True and relative echo trails.

Note: If the true trail is selected on the stabilized RM (CU, NU), targets whose extensions hit own ship are not always on a collision course.

Starting echo trail

Press the ECHO TRAIL key to start the echo trail function. "REL (or TRU) TRAIL", the echo trail time selected (on the TRAIL menu) and elapsed time appear at the top right-hand corner of the display. Then, afterglow starts extending from all targets.

Canceling echo trail

Press the ECHO TRAIL key to erase echo trails and echo trail indications.

Trail time

Trail time can be selected on the TRAIL menu.

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select TIME and press the ENTER/SELECT key.

5)Select trail time among 15 seconds, 30 sec- onds, 1, 3, 6, 15, 30 min, or continuous (99 minutes 59 seconds).

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Trail reference

Echo trails can be displayed relative to own ship (relative) or with reference to north (true).

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select MODE and press the ENTER/SELECT key.

5)Select trail reference; true or relative.

6)Press the ENTER/SELECT key.

7)Press the MENU key.

Trail gradation

Echo trails may be shown in monotone or gradual shading (multiple). Gradual shading paints the trails getting thinner with time just like the after- glow on an analog PPI radar.

Monotone trail

Multitone trail

Figure 1-22 Comparison of

trail gradation types

1)Press the MENU key.

2)Select the TRAIL menu.

3)Press the ENTER/SELECT key.

4)Select TONE and press the ENTER/SELECT key.

5)Select SGL or MULT.

6)Press the ENTER/SELECT key.

7)Press the MENU key.

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Contents Marine Radar First Edition NOV Safety Information Do not diassemble or modify the equipment Radio Frequency Radation Hazard IiiUse the correct fuse Table of Contents Maintenance Foreword Features Word to FR-8051/8111/8251 OwnersVii Configuration of FR-8051/8111/8251 Antenna Unit SpecificationsTransceiver Module Environmental Conditions Power Supply and Power ConsumptionDisplay Unit OthersXii Equipment ListsStandard Set Name Type Qty RemarksXiii Optional EquipmentSpare Parts Name Type Code No RemarksXiv Categorization by SpecificationFunction Type Operation Control DescriptionDisplay Indications 25 NMDisplay indications lower part Selecting Range Turning the Radar On/OffTransmitting, Stand-by Selecting presentation mode Presentation ModePresentation mode Description Representative display Presentation mode DescriptionBasic menu operation Menu OverviewChanging pages on the Initial menu Menu tree MK Erase erase all fixed marksInitial Tune SET AUTO, Manu SPD Mode MAN, LOG, NAV Adjusting Picture Brilliance Tuning the ReceiverAdjusting Sensitivity Selecting tuning modeSuppressing Sea Clutter Adjusting Brilliance of Control Panel and MarkersAdjusting Range Ring Brilliance Automatic anti-clutter controlMeasuring the Range Suppressing Rain ClutterHeading and North Markers Measuring range by the range ringsMeasuring Bearing Canceling the cursor offset Collision Assessment by Measuring Range Offset EBLIndex Lines Off-centering the PictureInscribing Marks on the Display ZoomFunction key Turning on a function Own Ship SpeedAutomatic speed input Echo Trails Ship’s GraphicInterference Rejector Manual speed inputTrail time Canceling echo trailStarting echo trail Trail referenceTrail brilliance Electronic Plotting E-plotPlotting a target True or relative vector Canceling target plottingTarget data Vector timeSelecting guard zone type Setting a Guard Alarm ZoneSetting a guard zone Activating the guard zonesCanceling the guard zone and guard alarm Watch AlarmSilencing the aural alarm How to turn on echo averagingSuppressing Second-Trace Echoes 26 Echo averageNoise Rejection Presetting pulselengthEcho Stretch Selecting PulselengthOutputting Cursor Position TLL data Waypoint DisplaySelecting pulselength set to use Selecting Unit of Range Measurement, Bearing Reference Alarm Output Signal On/OffSector Blanking Radar Observation Range ResolutionRadar Picture, Target Properties and Radar Pulse Indirect echoes Bearing ResolutionFalse Echoes Multiple echoesMinimum range Minimum and Maximum RangesSide-lobe echoes Blind and shadow sectorsLocating a Ship or Survival Craft in Distress by Sart Gain Maintenance When Working on the Antenna UnitInterval Check point Check and measures Remarks Part Type Life expectancy RemarksSimple Troubleshooting TroubleshootingProblem Remedy Serviceman qualification Advanced-level TroubleshootingProblem Check point and probable Remedy Cause Problem Check point and probable Remedy Cause Problem Check point and probable Remedy Cause Diagnostic Test Diagnostic test, test patternLocation of Parts Antenna UnitRF Transceiver Unit Modulator TriggerRF transceiver unit FR-8051/8111 Display Unit common to all models Display unit, top viewDisplay unit, right side view Transmitter Receiver Performance Performance MonitorOperating a performance monitor Display Meaning Transmitter normal Receiver normalVideo Plotter RP-15 Auto Plotter ARP-15Fluxgate Heading Sensor C-2000 Page