Furuno FR-1710 manual Off-centering shift, Acknowledging alarm, Deactivating target alarm zone

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Target alarm zone

A B

Figure 1-20 Target alarm

Note: If you wish to create a target alarm zone having a 360-degree coverage around own ship, set point “B” in almost the same direction (approx. ±3°) as point “A” and press the [GZ ALARM] key.

Two alarm zones can be set as described above. To change the active alarm zone, do steps 1 thru 4 in the above procedure. (When both alarms are prepared the active alarm is circumscribed.)

Acknowledging alarm

A target entering the target alarm zone pro- duces both visual (flashing) and audible (beeping) alarms. To silence the audible alarm, press the [AUDIO OFF] key shortly. ACK replaces IN (or OUT).

This will deactivate the audible alarm but will not stop the flashing of the target in the guard alarm zone. To reactivate the audible alarm, press the [GZ ALARM] key again.

To silence the audible alarm, you may press the [AUDIO OFF] key. However, in this case, the label ACK does not appear.

outward target alarm is produced when a tar- get leaves the target alarm zone. (This is not a target alarm by definition but some users find this feature valuable.)

Dashed line: No alarm. Alarm sounds when target violates alarm setting.

Target alarm zone

INWARD ALARM

OUTWARD ALARM

Figure 1-21 Inward and outward alarms

1.23 Off-centering (shift)

Own ship position, or sweep origin, can be displaced to expand the view field without switching to a larger range scale. The sweep origin can be off-centered to a point speci- fied by the cursor, up to 75% of ranges other than 72, 96 and 120 nm.

This feature is not available on the longest range scale or in the true motion mode. The number of range rings increases keeping the original range intervals unchanged.

To off center the radar picture:

1.Place the cursor at a position where you wish to move the sweep origin by operat- ing the trackball.

2.Press the [SHIFT] key. Then, the sweep origin is off-centered to the cursor posi- tion. However, the heading line is left in the same position.

3.To cancel off-centering, press the [SHIFT] key again.

Deactivating target alarm zone

Hold the [GZ ALARM] key depressed for at least 5 seconds.

Inward and outward alarms

The inward target alarm generates visual and audible warnings when a target enters the target alarm zone from any direction. The

 

 

 

Cursor

Cursor

 

 

 

(a) Select location

(b) Press SHIFT

with cursor.

key to offcenter.

Figure 1-22 Off-centered display

1-17

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Contents Marine Radar First Edition NOV Keep heater away from equipment Do not operate the equipment with wet handsDo not disassemble or modify the equipment Do not open the equipmentUse the proper fuse Table of Contents Declaration of Conformity FR-1760DS SP-1Introduction FeaturesWord to the Owner of This Furuno Radar FR-1760DS System ConfigurationAntenna Unit Display Unit FR-1710/1725Viii Menu TreePlot Menu Mark Disp OFF Erase VEC REF REL True VEC Time Curs RNG INT REJ OFF Stretch Enhance Contrast Auto Xii Operational Overview Turning on the PowerTransmitter on Control description Control DescriptionCRT Brilliance Tuning the ReceiverControl Panel Backlighting Initializing the Compass Readout Degaussing the ScreenOn-screen legends and markers On-screen Legends and MarkersPresentation Modes Selecting presentation modeCourse-up Mode Screen shows Selecting the Range ScaleAutomatic speed input Entering Own Ship’s SpeedManual speed input 10 Echo stretch Pulselength, Echo StretchS1P Suppressing Sea Clutter Adjusting the SensitivityManual adjustment by the A/C SEA control Automatic adjustment by the A/C Auto controlInterference Rejector Suppressing Precipitation ClutterMeasuring range by the variable range marker VRM Measuring the RangeMeasuring Bearing Measuring range by the fixed range ringsMeasuring Range and Bearing Between Two Targets Collision Assessment by the Offset EBL18 Measuring range and bearing Between two targets Setting a Target Alarm ZoneOff-centering shift Acknowledging alarmDeactivating target alarm zone Inward and outward alarms23 Echo SIG menu Echo AveragingPlotting a target Electronic Plotting Aid EPAReading the target data True or relative vector, vector timeTarget data Terminating target plottingCPA/TCPA Alarm Setting CPA/TCPA alarm rangesSilencing CPA/TCPA audible alarm Lost target alarmPast plot points Target Trails Echo TrailsTrue or relative trails Displaying, erasing target trails Trail gradationSelecting trail time Restoring trailsTrail afterglow Resetting target trailsTrail brilliance Thin trailsOrigin Mark Parallel Index LinesMarkers ZoomFunction Keys Presetting the user keysPresetting the function keys User Keys F1, F2, F342 FUNC1 menu Func key objectivesSuppressing Second-trace Echoes Adjusting Brilliance of Screen DataNoise Rejector Time AlarmEnhanced Video Navigation Data Degaussing IntervalClutter Sweep Video ContrastOutputting Target Position Available color combinations Background ColorSelecting Range Scales Selecting Bearing Scale FormatA/D curve settings 46 A/D Converter Curve SettingEnlarging Close-in Targets Alarms AlarmsPeformance Monitor Alarms con’tMinimum and maximum ranges Radar resolutionRadar Observation GeneralMultiple echoes False EchoesBearing accuracy Range measurementVirtual image Sart Search and Rescue TransponderShadow sectors Radar bandwidth Sart range errorsShowing Sart marks on the radar display General remarks on receiving SartSEA control Racon Radar BeaconRadar side lobes GainOn next MAINTENANCE, TroubleshootingPeriodic Maintenance Schedule Maintenance scheduleLife Expectancy of Major Parts Maintenance schedule con’tLife expectancy of major parts Easy troubleshooting Fuse Replacement Simple TroubleshootingReplacement of Batteries Battery replacement informationServiceman qualification Advanced-level TroubleshootingService call Problem Check point Remedy Probable cause Advanced-level troubleshootingAdvanced-level troubleshooting con’t Sequence for diagnostic test Diagnostic TestTest results screen Display circuit test Left side view Parts LocationDisplay unit, top view Scanner unit, left side view FR-1760DS Scanner UnitScanner unit, right side view, RF section removed FR-1760DS Scanner Unit con’tFR-1760DS Power supply unit FR-1760DS Power Supply UnitRF module Upper part FR-1710/1725 Scanner UnitModule Lower part Specifications of Marine Radar Radar Display Dimension and Mass Coating Color Racon IndexIndex-2