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Thank you for purchasing this FURUNO radar. We are confident you will discover why FURUNO has become synonymous with quality and reliability. Dedicated in the design and manufacture of marine electronics equipment for half a century, FURUNO Electric Company has gained an unrivaled reputation as a world leader in the industry. This is the result of our technical excellence as well as our worldwide distribution and service network. Please carefully read and follow the safety information and operating and maintenance instructions set forth in this manual before attempting to operate the equipment and conduct any maintenance. Your radar set will perform to the utmost of its ability only if it is operated and maintained in accordance with the correct procedures.

INTRODUCTION...........................................................................................................................................viii A WORD TO THE OWNER OF FURUNO RADAR................................................................................................. VIII SPECIFICATIONS OF FR-2105/2105-B SERIES RADAR AND ARPA.......................................................................XI CHAPTER 1 OPERATION .1 1.1 TURNING ON THE POWER 1.2 TRANSMITTER ON 1.3 CONTROL HEAD 1.4 CRT BRILLIANCE 1.5 TUNING THE RECEIVER 1.6 ON-SCREEN LEGENDS AND MARKERS 1.7 DEGAUSSING THE CRT SCREEN 1.8 INITIALIZING THE GYRO READOUT 1.9 PRESENTATION MODES 1.10 SELECTING THE RANGE SCALE 1.11 SELECTING THE PULSELENGTH 1.12 ADJUSTING THE SENSITIVITY 1.13 SUPPRESSING SEA CLUTTER 1.14 SUPPRESSING PRECIPITATION CLUTTER 1.15 INTERFERENCE REJECTOR 1.16 MEASURING THE RANGE 1.17 MEASURING THE BEARING 1.18 COLLISION ASSESSMENT BY OFFSET EBL 1.19 MEASURING RANGE AND BEARING BETWEEN TWO TARGETS 1.20 SETTING A TARGET ALARM ZONE 1.21 OFF-CENTERING 1.22 ECHO STRETCH 1.23 ECHO AVERAGING 1.24 ELECTRONIC PLOTTING AID (EPA) 1.25 ENTERING OWN SHIP'S SPEED 1.26 TARGET TRAILS (ECHO TRAILS) 1.27 PARALLEL INDEX LINES 1.28 ORIGIN MARK 1.29 ZOOM 1.30 MARKERS 1.31 MENU KEYS 1.32 RADAR 1, 2 AND 3 MENU SETTINGS 1.33 FUNCTION KEYS vi 1.34 BARGE INFORMATION 1.35 RADAR MAP 1.36 SUPPRESSING SECOND-TRACE ECHOES 1.37 DISPLAYING EXTERNAL WAYPOINT AND NAVIGATION LINE 1.38 ADJUSTING BRILLIANCE OF SCREEN DATA 1.39 DISPLAY OF WIND/TIDE/DEPTH INFORMATION 1.40 ALARMS CHAPTER 2 OPERATION OF ARPA (OPTION) .1 2.1 GENERAL 2.2 KEYPADS FOR ARPA 2.3 ARPA MENU OPERATION 2.4 START-UP PROCEDURE 2.5 AUTOMATIC ACQUISITION 2.6 MANUAL ACQUISITION 2.7 CHANGING PLOT SYMBOL SIZE 2.8 ADJUSTING BRILLIANCE OF PLOT MARKS 2.9 DISPLAYING TARGET DATA 2.10 VECTOR MODES 2.11 PAST POSITION DISPLAY 2.12 SET AND DRIFT (SET AND RATE) 2.13 SETTING CPA/TCPA ALARM RANGES 2.14 SETTING A GUARD ZONE 2.15 OPERATIONAL WARNINGS 2.16 TRIAL MANEUVER 2.17 ARPA PERFORMANCE TEST 2.18 CRITERIA FOR SELECTING TARGETS FOR TRACKING 2.19 FACTORS AFFECTING ARPA FUNCTIONS CHAPTER 3 RADAR OBSERVATION .1 3.1 GENERAL 3.2 FALSE ECHOES 3.3 SART (SEARCH AND RESCUE TRANSPONDER) 3.4 RACON (RADAR BEACON) CHAPTER 4 OPERATION OF VIDEO PLOTTER .1 4.1 GENERAL 4.2 THE VIDEO PLOTTER DISPLAY 4.3 DISPLAY MODES 4.4 SET- UP OF VIDEO PLOTTER DISPLAY 4.5 TRACK vii 4.6 MARKS, LINES 4.7 WAYPOINTS 4.8 NAVIGATION LINES 4.9 RECORDING & REPLAYING DATA 4.10 PLOTTER PRESENTATION MODE 4.11 INITIAL SETTINGS 4.12 LATITUDE ERROR TABLE (ON 96 NM RANGE SCALR) CHAPTER 5 MAINTENANCE .1 5.1 PERIODIC MAINTENANCE SCHEDULE 5.2 LIFE EXPECTANCY OF MAJOR PARTS 5.3 REPLACEMENT OF BATTERY CHAPTER 6 TROUBLESHOOTING .1 6.1 EASY TROUBLESHOOTING 6.2 ADVANCED-LEVEL TROUBLESHOOTING 6.3 DIAGNOSTIC TEST CHAPTER 7 MENU OVERVIEW .1 CHAPTER 8 ANLILLARY EQUIPMENT .1 8.1 PERFORMANCE MONITOR 8.2 INTERSWITCHING UNIT 8.3 FOR FISHING VESSEL CHAPTER 9 DIGITAL INTERFACE (IEC61162-1) .1 CHAPTER 10 PARTS LIST AND MAJOR PARTS LOCATION .1 Declaration of Conformity to Type (FR-21X5 series) Declaration of Conformity (FR-2155, FR-2165DS)

New standard of marine radar technology through 50 years of FURUNO's marine electronics activities 21" MULTI-COLOR HIGH-PERFORMANCE SHIPBORNE RADAR AND ARPA MODEL FR-2105/2105-B SERIES FURUNO ELECTRIC CO., LTD. NISHINOMIYA, JAPAN