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A Word to the Owner of FURUNO Radar 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 more than 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 world- wide 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 con- duct 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 SYSTEM CONFIGURATION ix 1. OPERATION 1.1 Turning on the Power -1 1.2 Transmitter ON -2 1.3 Control Head -3 1.4 CRT Brilliance -5 1.5 Tuning the Receiver -5 1.6 On-screen Legends and Markers -6 1.7 Degaussing the CRT Screen -7 1.8 Initializing the Gyro Readout -8 1.9 Entering Own Ship's Speed -9 1.10 Presentation Modes -10 1.11 Selecting the Range Scale -13 1.12 Selecting the Pulsewidth -13 1.13 Adjusting the Sensitivity -15 1.14 Suppressing Sea Clutter -15 1.15 Suppressing Precipitation Clutter -17 1.16 Interference Rejector -17 1.17 Measuring the Range -18 1.18 Measuring the Bearing -20 1.19 Collision Assessment by Offset EBL -21 1.20 Measuring Range and Bearing Between Two Targets -22 1.21 Setting a Target Alarm Zone -23 1.22 Off-Centering -25 1.23 Echo Stretch -25 1.24 Echo Averaging -26 1.25 Electronic Plotting Aid (EPA) -28 1.26 Target Trails -32 1.27 Parallel Index Lines -34 1.28 Origin Mark -36 1.29 Zoom -37 1.30 Markers -37 1.31 Menu Keys -38 1.32 RADAR 1, 2 and 3 Menu Settings -39 1.33 Function Keys -40 1.34 Barge Information -46 1.35 Radar Map -46 1.36 Suppressing Second-trace Echoes -50 1.37 Displaying External Waypoint and Navigation Line -50 1.38 Adjusting Brilliance of Screen Data -51 1.39 Display of Wind/Tide/Depth/Time -52 1.40 Rate-of-Turn Scale -53 1.41 Alarms -54 vi 2. RADAR OBSERVATION 2.1 General -1 2.2 False Echoes -3 2.3 SART (Search and Rescue Transponder) -5 2.4 RACON (Radar Beacon) -7 3. MAINTENANCE 3.1 Periodic Maintenance Schedule -2 3.2 Life Expectancy of Major Parts -2 3.3 Replacement of Battery -3 4. TROUBLESHOOTING 4.1 Easy Troubleshooting -2 4.2 Advanced-level Troubleshooting -2 4.3 Diagnostic Test -4 5. ARPA ARP-26 (Option for NM-type radar) 5.1 General -1 5.2 Controls for ARPA -2 5.3 ARPA Menu Operation -2 5.4 Start-up Procedure -4 5.5 Automatic Acquisition -6 5.6 Manual Acquisition -9 5.7 Changing Plot Symbol Size, Plot Symbols -10 5.8 Adjusting Brilliance of Plot Marks -12 5.9 Displaying Target Data -13 5.10 Vector Modes -14 5.11 Past Position Display -15 5.12 Set and Drift (Set and Rate) -16 5.13 Setting CPA/TCPA Alarm Ranges -17 5.14 Setting a Guard Zone -18 5.15 Operational Warnings -20 5.16 Trial Maneuver -21 5.17 ARPA Performance Test -24 5.18 Criteria for Selecting Targets for Tracking -25 5.19 Factors Affecting ARPA Functions -26 6. VIDEO PLOTTER RP-26 (Option for NM-type radar) 6.1 General -1 6.2 The Video Plotter Display -2 6.3 Display Modes -2 6.4 Set-up of Video Plotter Display -4 6.5 Track -6 6.6 Marks, Lines -8 6.7 Waypoints -11 6.8 Navigation Lines -13 6.9 Recording, Replaying Data -16 6.10 Initial Settings -17 vii APPENDIX Menu Tree A-1 Set-up for Fishing Vessel A-6 SPECIFICATIONS SP-1 INDEX viii

MARINE RADAR MODEL FR-2125V