Furuno 841 MARK-2 manual Foreword, Features

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FOREWORD

Congratulations on your choice of the FURUNO MODEL 841 MARK-2 Marine Radar. We are confident you will see why the FURUNO name has become synony- mous with quality and reliability.

For over 40 years FURUNO Electric Com- pany has enjoyed an enviable reputation for innovative and dependable marine electron- ics equipment. This dedication to excellence is furthered by our extensive global network of agents and dealers.

Your radar is designed and constructed to meet the rigorous demands of the marine en- vironment. However, no machine can per- form its intended function unless properly installed and maintained. Please carefully read and follow the recommended proce- dures for installation, operation and main- tenance.

While this unit can be installed by the pur- chaser, any purchaser who has doubts about his or her technical abilities may wish to have the unit installed by a FURUNO rep- resentative or other qualified technician. The importance of a thorough installation can- not be overemphasized.

We would appreciate hearing from you, the end-user, about whether we are achieving our purposes.

Thank you for considering and purchasing FURUNO equipment.

Features

Your radar has a large variety of functions, all contained in a remarkably small cabinet.

The main features of the MODEL 841 MARK-2 are:

•Traditional FURUNO reliability and quality in a compact, lightweight and low-cost radar.

•Smartly styled, light-weight and compact radome antenna fits even on small yachts.

•Durable brushless antenna motor.

•High definition 8" LCD raster-scan dis- play.

•On-screen alphanumeric readout of all operational information.

•Standard features include EBL (Elec- tronic Bearing Line), VRM (Variable Range Marker), Guard Alarm, Display Off Center and Echo Trail.

•Watchman feature periodically transmits the radar to check for radar targets which may be entering (or exiting) the alarm zone.

•Operates on 10.2 to 31.2 V DC power supply and consumes about 40 W.

•Ship’s position in latitude and longitude (or Loran C Time Differences), range and bearing to a waypoint, ship’s speed, head- ing and course can be shown in the bot- tom text area. (Requires a navigation aid which can output such data in NMEA 0183 format.)

•Zoom feature provided.

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Contents Marine Radar B . N o . O M E 3 4 4 4 Safety Instructions Do not operate the equipment with wet hands Do not open the equipment Stay away from transmitting antenna Do not disassemble or modify the equipmentUse the correct fuse IiiTable of Contents Foreword FeaturesDisplay Unit SpecificationsAntenna Unit Transceiver Module contained in radomeInterface Nmea Complete Set Installation Materials CP03-15xxAccessories FP03-05900 Equipment ListOptional Equipment Model 841 MARK-2 ConfigurationPrinciple of Operation How radar works Control Description Operation675NM 220.9R 0.646NM 308.7R Display Indications and MarkersTurning the Radar On and Off 5NMSelecting the Range Adjusting LCD Backlighting and Display ToneAdjusting Control Panel Brilliance TransmittingGeneral procedure Adjusting GAIN, STC, A/C Rain and FTCSTC MAN Auto How to tune manually Tuning the ReceiverAdjusting A/C Rain Adjusting FTCMeasuring 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 ModeCU course-up Selecting the Presentation ModeWindow Display Course-up, you may select CU or WPT- UP, on the menuWPT-UP waypoint-up Guard AlarmSetting the guard zone Silencing the audible alarmSuppressing Radar Interference Canceling the guard zoneOff Centering the Display Suppressing Noise InterferenceSelecting Pulselength Navigation Data Display Echo TrailsTurning echo stretch on or off Setting up the nav data displayEcho Stretch magnifying long range echoes Press the Menu key Select Nav Data and press the ENT keyTurning on watchman Selecting Unit of Measurement for RangeSelecting Bearing Reference WatchmanDisplaying Navigation Data During Stand-by Canceling watchmanErasing the Heading Marker Deselecting RangesDisplaying Cursor Position, Range and Bearing to Cursor Visual Alarm IndicationsError Visual alarm Outputting Cursor Position to NavigatorSuper-refraction Interpreting the DisplayRadar Wave and Radar Horizon Target Properties and Radar Wave ReflectionMultiple echoes Bearing ResolutionRange Resolution False 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 connectionHeading Sensor Connection To connect external equipment to the OP- Tion connectorFor E/S Navigation aid, video sounder 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