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NorthStar Navigation 491 - page 1
491 E CHO S OUNDER I NSTALLATION M ANUAL Rev A P art Number G M495 Northstar a unit of Brunswick New Technologies Marine Electronics 30 Sudbury Road Acton, Massachusetts 01720 www.NorthstarNav.com Service: 978/897-6600 Sales: 800/628-4487 ...
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NorthStar Navigation 491 - page 2
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NorthStar Navigation 491 - page 3
T able of C ontents S ECTI O N O N E — Intr oduction - - - - - - - - - - - - - - - - - - - - 1 W elcome to the N orthstar 491 - - - - - - - - - - - - - - - - - 1 Who should read this manual - - - - - - - - - - - - - - - - - 1 Scope of this manual - - - - - - - - - - - - - - - - - - - - - 1 Installation considerations - - - - - - - - - - - - - - - ...
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NorthStar Navigation 491 - page 4
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NorthStar Navigation 491 - page 5
491 INSTALLATION MANUAL Revision A PAGE 1 S ECTI O N O N E — Intr oduction W elcome to the Northstar 49 1 An echo sounder is a device that pro vides information about the water directly beneath a vessel. T he Northstar ec ho sounder system consists of: • the Northstar 491 echo sounder sensor • a Northstar navigation system suc h as the 962, 9 ...
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NorthStar Navigation 491 - page 6
S E CTI ON O N E — Introduction PAGE 2 491 INSTALLATION MANUAL Revision A • connecting the 491 to a transducer (see also the T ransducer Connec- tor Instructions —G M492) • troubleshooting and testing the system • technical specifications f or the 491 For inf ormation about obtaining technical support and returning the 491 for factory se ...
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NorthStar Navigation 491 - page 7
491 INSTALLATION MANUAL Revision A PAGE 3 S ECTI O N T WO — Installing the tr ansducer Saf ety consider ations WARNING! Be sure to turn the power off before starting the installation. Further , it is highly recommended that you keep power off while you’re performing the installation. If power is left on or turned on during the installation, fir ...
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NorthStar Navigation 491 - page 8
S E CTI ON T WO — Inst alling the transducer PAGE 4 491 INSTALLATION MANUAL Revision A Selecting a tr ansducer Northstar recommends using an Airmar transducer with the N orthstar 491 echo sounder. The Airmar B260, B7 4 4 and P66 can be obtained from Northstar as an installation kit with connectors installed. A table of Airmar transducer elements ...
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NorthStar Navigation 491 - page 9
S E CTI ON T WO — Inst alling the transducer 491 INSTALLATION MANUAL Revision A PAGE 5 Installation consider ations The f ollowing basic setup inf ormation isn’t a substitute for the installa- tion instructions provided b y the transducer’ s manufacturer . T o ensure that you meet all critical installation parameters, be sure to read and fol- ...
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NorthStar Navigation 491 - page 10
S E CTI ON T WO — Inst alling the transducer PAGE 6 491 INSTALLATION MANUAL Revision A • the path for running the transducer’ s cable is reasonably direct—keep in mind that the transducer cable is 33 feet long (10 meters). T o pre- vent damage, coil any excess cable and secure it • water turbulence and noise are minimal, decreasing the am ...
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NorthStar Navigation 491 - page 11
S E CTI ON T WO — Inst alling the transducer 491 INSTALLATION MANUAL Revision A PAGE 7 FI GURE 1: R ecommended installation locations for a tr ansducer Installing the tr ansducer A flat- bottom hull provides the best environment f or mounting the trans- ducer: It provides a horizontal surface and a constant water flo w over the transducer , wit ...
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NorthStar Navigation 491 - page 12
S E CTI ON T WO — Inst alling the transducer PAGE 8 491 INSTALLATION MANUAL Revision A FI GURE 2: R ecommended transducer incline angle FI GURE 3: T ypical finished thru-hull installation with a fairing block (Airmar B7 4 4V) Maintaining the tr ansducer Do not expose the transducer’ s face or plastic housing to gasoline or strong solvents, suc ...
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NorthStar Navigation 491 - page 13
S E CTI ON T WO — Inst alling the transducer 491 INSTALLATION MANUAL Revision A PAGE 9 FI GURE 4: A nti-fouling paint ar eas (for A irmar B7 44V) Cleaning a tr ansducer T o clean the transducer of heavy debris or foul sea gro wth, use a stiff brush or putty knife, but don’t scratc h the surfaces. Check the transducer every few weeks, maximum. U ...
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NorthStar Navigation 491 - page 14
S E CTI ON T WO — Inst alling the transducer PAGE 10 491 INSTALLATION MANUAL Revision A ...
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NorthStar Navigation 491 - page 15
491 INSTALLATION MANUAL Revision A PAGE 11 S ECTI O N TH R E E — Installing the 4 9 1 Saf ety consider ations WARNING! Be sure to turn the power off before starting the installation. Further , it is highly recommended that you keep the power off while you’re performing the installation. If power is left on or turned on during the installation, ...
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NorthStar Navigation 491 - page 16
SEC TI ON THREE — Installing the 49 1 PAGE 12 491 INSTALLATION MANUAL Revision A ...
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NorthStar Navigation 491 - page 17
SEC TI ON THREE — Installing the 49 1 491 INSTALLATION MANUAL Revision A PAGE 13 S ystem components Figure 5 on page 13 shows a configured 961/962 ec ho sounder system, and Figure 6 on page 13 shows a configured 957 /95 8/6 000i echo sounder system. Figur e 5: E cho sounder system components with the Northstar 9 6 1 /962 Figur e 6: E cho sounde ...
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NorthStar Navigation 491 - page 18
SEC TI ON THREE — Installing the 49 1 PAGE 14 491 INSTALLATION MANUAL Revision A Choosing a mounting location Before an y drilling or cutting takes place, carefully c hoose a mounting location for the 491 module that meets the follo wing criteria: • where the transducer cable is kept securely away from other wires • where the path for running ...
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NorthStar Navigation 491 - page 19
SEC TI ON THREE — Installing the 49 1 491 INSTALLATION MANUAL Revision A PAGE 15 W iring the 49 1 The majority of installation problems are caused b y shortcuts taken with system cables. When installing the 491, be sure that you: • assemble connectors carefully • don’t make sharp bends in the cables • leave service and drip loops, so that ...
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NorthStar Navigation 491 - page 20
SEC TI ON THREE — Installing the 49 1 PAGE 16 491 INSTALLATION MANUAL Revision A FI GURE 8: Interface cable connection fr om 96 1 /962 to 4 9 1 Violet Black Blue Brown Orange White Green Red (not connected) 961/962 P1 Connector Plug (Wiring Side View) Data Cable 16 17 18 13 6 5 4 3 2 1 14 15 11 10 9 8 7 12 T able 4: Cable connection between the 9 ...
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NorthStar Navigation 491 - page 21
SEC TI ON THREE — Installing the 49 1 491 INSTALLATION MANUAL Revision A PAGE 17 Connecting the 4 91 to the 957 /95 8/ 6 000i The connection between the 95 7 /95 8/6 000i and the 4 91 requires the 10- foot (3- meter) data cable supplied with the 4 91. The cable connects to the AUX port on the back of the navigator . The cable is shipped with the ...
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NorthStar Navigation 491 - page 22
SEC TI ON THREE — Installing the 49 1 PAGE 18 491 INSTALLATION MANUAL Revision A Connecting the 4 91 to a tr ansducer T ransducers purchased from N orthstar (see page 4) are shipped with a connector installed. The f ollowing inf ormation is supplied for transducers purchased elsewhere and f or cases where it is necessary to remove and reinstall t ...
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NorthStar Navigation 491 - page 23
SEC TI ON THREE — Installing the 49 1 491 INSTALLATION MANUAL Revision A PAGE 19 Plug the transducer cable into the TRANSDUCER connector of the 491. If your transducer doesn’t support speed, you can connect a separate speed sensor , such as the Airmar ST650, to pins 1, 2 and 3, as shown in the table. Initial checkout This section assumes that t ...
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NorthStar Navigation 491 - page 24
SEC TI ON THREE — Installing the 49 1 PAGE 20 491 INSTALLATION MANUAL Revision A For the 957 /95 8/6 000i Y ou must set the navigator’ s AU X port to “Sounder”: 1. Press the STAR key to display the OPTIONS/SERVICE INFO screen, then press the PORT SETUP OPTIONS key . 2. Set the AUX PORT option to Sounder , then press the ENTER key . The ST A ...
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NorthStar Navigation 491 - page 25
491 INSTALLATION MANUAL Revision A PAGE 21 S ECTI O N F O U R — T r oubleshooting and servicing the 4 9 1 C ommon 49 1 installation pr oblems T ypical problems you may encounter either during or after the 491 installation process are outlined in Figure 12 on page 22 and Figure 13 on page 23. In the 961/962, the diagnostics screen may also help pi ...
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NorthStar Navigation 491 - page 26
S E CTI ON F O U R — T roubleshooting and servic ing the PAGE 22 491 INSTALLATION MANUAL Revision A Figur e 1 2: 9 6 1 /962 echo sounder system troubleshooting No echoes display ed when ST AR ke y is pressed. Is the 961/962 software V ersion 3.0 or greater? Has NMEA Port 3 been configured for the 491? Check the 491's ST A T indicator Is the ...
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NorthStar Navigation 491 - page 27
S E CTI ON F O U R — T roubleshooting and servic ing the 491 INSTALLATION MANUAL Revision A PAGE 23 Figur e 1 3: 957 /95 8/6 000i echo sounder system troubleshooting No echoes displayed on sounder screen. Has the navigator ʼs Aux Port been configured for the 491? Check the 491's ST A T indicator Is the Advance Speed set to zero? YES NO YES ...
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NorthStar Navigation 491 - page 28
S E CTI ON F O U R — T roubleshooting and servic ing the PAGE 24 491 INSTALLATION MANUAL Revision A Getting technical support After you’ ve follo wed the instructions in this manual, if you need addi- tional technical or operations support f or the 491, or if you have any other service- related questions, you can contact either your dealer or t ...
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NorthStar Navigation 491 - page 29
S E CTI ON F O U R — T roubleshooting and servic ing the 491 INSTALLATION MANUAL Revision A PAGE 25 Hearing fr om you Y our f eedback is important and helps N orthstar ensure that this manual is a valuable resource for all marine tec hnicians. Send your questions, comments, or suggestions about this manual to: docs@northstarcmc.com Or dering r ep ...
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NorthStar Navigation 491 - page 30
S E CTI ON F O U R — T roubleshooting and servic ing the PAGE 26 491 INSTALLATION MANUAL Revision A Returning a 4 9 1 f or service If you have overnight or second-day shipping requirements, before ship- ping the 491, please call Northstar for turnaround time, freight c harges, and payment arrangements. The 491 should be shipped only in a properl ...
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NorthStar Navigation 491 - page 31
491 INSTALLATION MANUAL Revision A PAGE 27 A PPEN DIX A — T echnical specifications T able 8: 4 9 1 technical specifications Perf ormance characteristics Frequencies 50 and 200 kHz Output power 1 000 watts with dual-element transducers 600 watts with single-element transducers Pulse lengths 0. 1 to 2 ms Pulse repetition rate 30 to 6 00 pulses/m ...
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NorthStar Navigation 491 - page 32
AP P E N DI X A — T echnical spec ific ations PAGE 28 491 INSTALLATION MANUAL Revision A Manual controls Gain 0 to 75 dB Clutter 0 to 9 Signal level 0 to 5 Noise limiter ON /OF F White level Backg round color Range up to 3500 feet (1 000 meters) Advance speed 1 /8 to 2/ 1 Depth units Feet, meters, fathoms Installation c alibrations Speed, temper ...
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NorthStar Navigation 491 - page 33
491 INSTALLATION MANUAL Revision A PAGE 29 Glossary cavit ation The f ormation of bubbles, which may negativel y impact a transducer’ s readings by reducing its ability to put energy into the water . deadrise The rise of the bottom of a vessel abo ve a horizontal line at the center of the vessel; that is, the slope of the hull away from the horiz ...
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NorthStar Navigation 491 - page 34
Glossary PAGE 30 491 INSTALLATION MANUAL Revision A ...
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NorthStar Navigation 491 - page 35
491 INSTALLATION MANUAL Revision A PAGE 31 Inde x A Airmar Technology Corporation 4 C Cable 491 and 961/962 14 491 and ship’s power 14 491 to 957/958/6000i 16 Cautions installation 2, 3, 11 interference with 491 11 tampering with the 491 11 transducer 3, 5, 19 troubleshooting the 491 19 wiring the 491 14, 17 E Echo sounder components of system 1, ...
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NorthStar Navigation 491 - page 36
Index PAGE 32 491 INSTALLATION MANUAL Revision A overview 11 safety considerations 11 troubleshooting 21 wiring 14 transducer cautions 3, 5, 19 cavitation 5 hull thickness limits 6 noise problems 5 preferred mounting location 5 recommended incline angle 8 thru-hull installation with a fairing block 8 M Maintenance, transducer 8 N Northstar feedback ...
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NorthStar Navigation 491 - page 37
Index 491 INSTALLATION MANUAL Revision A PAGE 33 U Upgrades, obtaining software 18 W Water column, definition of 29 Website addresses Airmar Technology Corporation 4 Northstar 24 Northstar Technologies 24 ...
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NorthStar Navigation 491 - page 38
Index PAGE 34 491 INSTALLATION MANUAL Revision A ...
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