Furuno FR-8251 Collision Assessment by Measuring Range Offset EBL, Canceling the cursor offset

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1.16 Collision Assessment by

1.17 Measuring Range and

the Offset EBL

Bearing Between Two Targets

The origin of the No.1 EBL can be placed any- where with the trackball to assess the risk of col- lision, as well as to measure the range and bearing between two targets.

1)Press the EBL ON key to turn on (or activate) the No.1 EBL.

2)Press the CURSOR OFFSET key.

3)Operate the trackball to place the No.1 EBL origin on the target.

4)Operate the EBL control to pass the No.1 EBL through the screen center.

You can anchor the EBL, to continue monitoring target’s track, by pressing the CURSOR OFFSET key again. If the target tracks along the No.1 EBL toward the screen center, the possibility of colli- sion exists.

No.1 EBL

Target

(initial position)

70.0°R

EBL

No.1

EBL bearing

Figure 1-14 How to assess risk of collision

Canceling the cursor offset

Press the CURSOR OFFSET key to return the No.1 EBL origin to the screen center. (Each press- ing of the key links the offset EBL with the cur- sor, anchors the offset EBL, or returns No.1 EBL origin to the screen center.)

The range and bearing between two targets, for example, targets A and B in Figure 1-15, can be measured by using the CURSOR OFFSET key.

1)Press the EBL ON key to turn on (or activate) the No.1 EBL.

2)Press the CURSOR OFFSET key.

3)Operate the trackball to place the No.1 EBL origin on target A.

4)Operate the EBL control to pass the No.1 EBL through target B.

5)Press the VRM ON key to turn on (or acti- vate) the No.1 VRM.

6)Operate the VRM control to place the No.1 VRM on the inside edge of target B.

Range and bearing between the two targets ap- pear in the cursor data window at the bottom of the display.

No.1 EBL

B

A

No.1 VRM

70.0°R

4.5NM

EBL

VRM

No.1 EBL

No.1 VRM

bearingrange

Figure 1-15 Measuring range and

bearing between two targets

1 – 14

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Contents Marine Radar 00080735211 Safety Information Do not diassemble or modify the equipment Radio Frequency Radation Hazard IiiUse the correct fuse Compliance with R&TTE Directive 1999/5/EC Table of Contents Maintenance Features Word to FR-8051/8111/8251 Owners ForewordVii Configuration of FR-8051/8111/8251 Specifications Antenna UnitTransceiver Module Environmental Conditions Power Supply and Power ConsumptionDisplay Unit OthersEquipment Lists Standard SetXii Optional Equipment Spare PartsXiii Categorization by Specification XivOperation Control DescriptionDisplay Indications 25 NMDisplay indications lower part Turning the Radar On/Off Selecting RangeTransmitting, Stand-by Presentation Mode Selecting presentation modeDescription Menu Overview Basic menu operationChanging 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 PictureZoom Inscribing Marks on the DisplayFunction key Own Ship Speed Turning on a functionAutomatic speed input Echo Trails Ship’s GraphicInterference Rejector Manual speed inputTrail time Canceling echo trailStarting echo trail Trail referenceElectronic Plotting E-plot Trail brilliancePlotting 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 PulselengthWaypoint Display Outputting Cursor Position TLL dataSelecting pulselength set to use Alarm Output Signal On/Off Selecting Unit of Range Measurement, Bearing ReferenceSector Blanking This page is intentionally left blank Range Resolution Radar ObservationRadar 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 This page is intentionally left blank Maintenance When Working on the Antenna UnitPeriodic Maintenance Schedule Troubleshooting Simple TroubleshootingAdvanced-level Troubleshooting Serviceman qualificationProblem Check point and probable Remedy Cause Problem Check point and probable Remedy Cause Diagnostic Test Diagnostic test, test patternThis page is intentionally left blank Location 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 This page is intentionally left blank Performance Monitor Operating a performance monitorAuto Plotter ARP-15 Video Plotter RP-15Fluxgate Heading Sensor C-2000 Page

FR-8251, FR-8111 specifications

Furuno has long been a leader in marine electronics, and its FR-8251 and FR-8111 radar systems continue that tradition. Both are advanced systems designed specifically for professional mariners who demand high performance, reliability, and technological sophistication in their navigational tools.

The Furuno FR-8251 is a powerful radar system that boasts a range of features tailored for commercial vessels. With a 25 kW transmitter, the FR-8251 delivers exceptional performance, providing a clearer and more detailed image of the maritime environment. It is equipped with advanced signal processing technology, including the Doppler processing feature, which allows for the detection of moving targets. This is highly beneficial for collision avoidance, as it provides accurate information regarding the speed and direction of other vessels.

Another noteworthy feature of the FR-8251 is its large, high-resolution display that enhances visibility and ease of use, even in challenging weather conditions. The user interface is straightforward, allowing for quick adjustments and easy navigation through the various settings. It supports a variety of display formats and allows for customization, enabling operators to tailor the information presented according to their specific needs.

On the other hand, the Furuno FR-8111 is equally impressive and designed as a more compact solution without sacrificing performance. This model comes with a 12 kW output and is specifically crafted for smaller vessels, yet it still delivers high-quality radar coverage. Utilizing Furuno’s renowned Automatic Target Tracker (ATT) technology, the FR-8111 enables mariners to efficiently track multiple targets, significantly enhancing situational awareness.

Additionally, both the FR-8251 and FR-8111 come with integrated ARPA (Automatic Radar Plotting Aid), providing users with sophisticated tools for navigation and collision avoidance. The presence of multiple target tracking empowers operators to make informed decisions, optimizing safety at sea.

Furuno’s commitment to reliability and durability is evident in both models, which are designed to withstand the harsh marine environment. Their robust build quality ensures longevity, while their advanced technologies offer peace of mind.

Both the Furuno FR-8251 and FR-8111 are excellent choices for professional mariners seeking cutting-edge radar systems. With their impressive performance, user-friendly interfaces, and advanced technologies, these radar systems set the standard in marine navigation, providing essential support for safe and efficient voyages.
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