Furuno 841 MARK-2 manual Guard Alarm, WPT-UP waypoint-up, Selecting guard zone type

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WPT-UP (waypoint-up)

An azimuth stabilized display in which the line connecting the center with the top of the display indicates the bearing to the “TO” waypoint, which is selected on the naviga- tional equipment connected to the radar. When navigating a route and own ship en- ters the arrival zone of a waypoint, the ra- dar displays the bearing to the next “TO” waypoint.

Procedure

1.Press the [MENU] key to open the menu.

2.Press the cursor pad to select 2. P/L, IR, NR & Radar Mode.

3.Press the cursor pad to select Radar mode.

4.Select option for CU or WPT-UP.

5.Press the [ENT] key followed by the [MENU] key.

NOTE:

Insert display example and description for each presentation mode, like in FR-1500M2 or FR- 8000 series’. Also, add section on how display is reset in true motion and change Table of Contents if necessary.

2.16 Guard Alarm

The guard alarm allows the operator to set the desired range and bearing for a guard zone. When ships, islands, landmasses, etc. enter (or exit, depending on type of guard zone in use.) the guard zone an audible alarm sounds to call the operator’s attention. The alarm is very effective as an anticollision aid when using an autopilot or navigating in narrow channels.

CAUTION

The guard alarm is a useful anti-collision aid, but

Selecting guard zone type

does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations. The alarm should never be used as the sole means for detecting possible collision situations.

The guard alarm can be set to sound on tar- gets entering (guard in) or exiting (guard out) the guard zone. Select type of guard zone as follows.

1)Press the [MENU] key to display the menu.

2)Select Mode & Function and press the [ENT] key.

3)Select Alarm Mode to IN or OUT.

4)Press the [ENT] key followed by the [MENU] key.

Dashed line: no alarm

Guard zone

IN ALARM

OUT ALARM

Figure 2-13 In and out alarms

Setting the guard zone

1)Mentally create the guard zone you want to display. See Figure 2-14 (1).

2)Operate the cursor pad to set cursor on top (bottom) left edge of the guard zone. Press the [GUARD] key. *G (IN) (or G OUT)), with asterisk blinking, appears at the top right-hand corner on the display. (The asterisk indicates the guard zone is partially set.) See Figure 2-14 (2).

3)Operate the cursor pad to set cursor on bottom (top) right edge of the guard zone and press the [GUARD] key. The aster- isk disappears. See Figure 2-14 (3).

4)Guard zone appears on the display. See Figure 2-14 (4).

Silencing the audible alarm

Any ships, landmasses, etc. coming into (or going out of) the guard zone will trigger the audible alarm and display the guard zone in reverse video. You can silence the alarm by

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Contents Marine Radar B . N o . O M E 3 4 4 4 Safety Instructions Stay away from transmitting antenna Do not open the equipmentDo not disassemble or modify the equipment Do not operate the equipment with wet handsUse the correct fuse IiiTable of Contents Foreword FeaturesAntenna Unit SpecificationsTransceiver Module contained in radome Display UnitInterface Nmea Accessories FP03-05900 Installation Materials CP03-15xxEquipment List Complete SetOptional Equipment Model 841 MARK-2 ConfigurationPrinciple of Operation How radar works Control Description OperationTurning the Radar On and Off Display Indications and Markers5NM 675NM 220.9R 0.646NM 308.7RAdjusting Control Panel Brilliance Adjusting LCD Backlighting and Display ToneTransmitting Selecting the RangeGeneral procedure Adjusting GAIN, STC, A/C Rain and FTCSTC MAN Auto Adjusting A/C Rain Tuning the ReceiverAdjusting FTC How to tune manuallyMeasuring the Bearing Measuring the RangePress the Menu key to open the menu. The main menu appears Menu OperationSee the table on the next Menu Function Menu description11 Display modes Selecting the Display ModeWindow Display Selecting the Presentation ModeCourse-up, you may select CU or WPT- UP, on the menu CU course-upSetting the guard zone Guard AlarmSilencing the audible alarm WPT-UP waypoint-upSuppressing Radar Interference Canceling the guard zoneOff Centering the Display Suppressing Noise InterferenceSelecting Pulselength Navigation Data Display Echo TrailsEcho Stretch magnifying long range echoes Setting up the nav data displayPress the Menu key Select Nav Data and press the ENT key Turning echo stretch on or offSelecting Bearing Reference Selecting Unit of Measurement for RangeWatchman Turning on watchmanErasing the Heading Marker Canceling watchmanDeselecting Ranges Displaying Navigation Data During Stand-byError Visual alarm Visual Alarm IndicationsOutputting Cursor Position to Navigator Displaying Cursor Position, Range and Bearing to CursorRadar Wave and Radar Horizon Interpreting the DisplayTarget Properties and Radar Wave Reflection Super-refractionRange Resolution Bearing ResolutionFalse Echoes Multiple echoesIndirect echoes Side-lobe echoesNautical Chart and Radar Picture Safety Information Maintenance & TroubleshootingReplacing the Fuse Preventative MaintenancePeriod Check point Remarks But Then TroubleshootingSelf Test Self TestSiting, handling considerations Antenna Unit InstallationMounting Parallel with the fore and aft line Holes for antenna unitMounting considerations Display Unit InstallationDisplay unit is designed to be mounted on a tabletop Mounting procedureConnections Signal cable connectionFor E/S To connect external equipment to the OP- Tion connectorNavigation aid, video sounder connection Heading Sensor ConnectionRadar Installation Check ListDisplaying the Installation Menus Initial Adjustment of PictureFollow the procedure below to obtain proper radar picture Relative Bearing Alignment Entering Initial SettingsSweep Timing Press the Menu key and turn off the power Closing the Installation MenusPage Page Page Page Page Page
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