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Northstar 491
Echo Sounder
Operations Manual
This manual is for using the 491 sounder with the
Northstar 957, 958, 961 and 962 navigators. For the
Northstar 6000i, information in Section 6 of its manual can
be used instead.
Revision A
Part Number GM494
Northstar
a unit of Brunswick New Technologies Marine Electronics
www.NorthstarNav.com
30 Sudbury Road Service: 978/897-6600
Acton, Massachusetts 01720 Sales: 800/628-4487
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Contents 1 Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Welcome to the Northstar 491 . . . . . . . . . . . . 2 Using this manual . . . . . . . . . . . . . . . . . . . . . . 2 Technical support . . . . . . . . . . . . . . . . . . . . . . 4 How echo sounding works . . . . . . . . . . . . . . . 5 Powering the 491 on and off . . . . . . . . . . . . . 7 Setting up the 491 . . . . . .
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Introducing snapshots . . . . . . . . . . . . . . . . . 46 Setting up the video image overlay . . . . . . . 49 6 Reviewing past echoes using SoundTrac . . . . . 51 Viewing past echoes using SoundTrac . . . . . 52 Marking fish as waypoints . . . . . . . . . . . . . . 53 Navigating to a past echo position . . . . . . . . 53 7 Setting the Alarms . . . . . . . . . . . . . . . . . . . . . . . . . 55 Understanding the alarms . . . . . . . . . . . . . .
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1Welcome Welcome to the Northstar 491 . . . . . . . . . . . . . 1-2 Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Technical support . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 How echo sounding works . . . . . . . . . . . . . . . . . 1-5 Powering the 491 on and off . . . . . . . . . . . . . . 1-7 Setting up the 491 . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 This chapter introduces the Northstar 491 Operations Manual,
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Welcome to the Northstar 491 Congratulations on your purchase of the Northstar 491 Echo Sounder. The 491 connects with a Northstar navigator and a third-party transducer to add echo sounding capability to the Northstar 957, 958, 961, and 962 navigators. See the Northstar 491 Installation Manual (part number GM495) for recommended transducers. You may be adding the 491 to your existing Northstar navigator for echo sounding, or you may have purchased your navigator complete wi
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Chapter 4 describes how to adjust the depth settings to choose what portion of the water under the vessel you’ll display. Chapter 5 explains other functions—the A-Scope, etc. Chapter 6 describes Northstar’s exclusive SoundTrac™ feature, for accessing past echoes and navigating back to their locations. Chapter 7 tells how to use the echo sounder’s alarms: the fish alarm, bottom alarm, and temperature alarm. At the back of the manual are a glossary and an appendix outlining the
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Technical support After you follow the instructions in this manual, if you need technical support or if you have any other questions, you can contact Northstar by email, fax, phone, or U.S. mail as follows: Table 1: Contacting Northstar Email: Service: service@northstarnav.com Sales: sales@northstarnav.com Fax: Service: 978/897-1595 Sales: 978/897-7241 Telephone: 978/897-6600 or 800/628-4487 U.S. mail: 30 Sudbury Road Acton, MA 01720 Web site: www.northstarnav.com (
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To prevent delays, it is critical that you first obtain a Return Materials Authorization (RMA) number before returning your unit to the factory. If you purchased your 491 through a dealer, to get an RMA number, call the dealer with the serial number. The 491’s serial number is located at the top of the unit. The 491 should be shipped in a properly designed carton with packing material. Please reference the RMA number on the outside of the carton. Shipments to Northstar should be mad
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GPS antenna 33-foot cable (part of transducer) 491 module 957/958/6000i Navigator 10-foot cable Ship's Transducer (Northstar-supplied) Power 10-foot cable (Northstar-supplied) Figure 1: 957/958 echo sounder system components GPS antenna Control Head 33-foot cable (part of transducer) 491 module 961/962 Processor 10-foot cable Ship's Transducer (Northstar-supplied) Power 10-foot cable (Northstar-supplied) Figure 2: 961/962 echo sounder system components Page 6 491 Echo Sounder Operations
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Powering the 491 on and off As part of its power-up sequence, the navigator automatically activates the 491. The 491 is automatically shut off by the navigator when you press and hold PWR until the screen goes dark. Setting up the 491 Your 491 should be installed by a qualified marine technician. Your satisfaction with the system’s performance will be greatly influenced by the practical knowledge and experience of the installer. Unlike GPS or other marine electronics systems, echo
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4. Check that the FORMAT option is set to “490.” If not, set it now. Before starting, you should double-check that the navigator’s Using the 491 with AUX port is set to the Sounder option: the 957/958 1. Press STAR until you reach the OPTIONS/SERVICE INFO screen. 2. Press the PORT SETUP OPTIONS key. 3. Check that the AUX PORT option is set to “Sounder.” If not, set it now. Page 8 491 Echo Sounder Operations Manual
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Figure 3: STAR key Auto Picture ECHO Frequency SCREEN Zoom Depth More Depth settings Picture settings Gain Shift Clutter More settings Range Noise Limiter Alarms Hue Advance Speed Bottom box Signal level Snapshot Return Return A-Scope Data Return Alarm settings Data on-screen Snapshot Bottom box Display Fish alarm Temp box Rename Bottom alarm Temp graph Temp alarm Speed Archive Erase Return Return Return Figure 4: 961/962 echo sounder menu structure 491 Echo Sounder Operations Manual Page 9
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STAR key Auto Picture ECHO Frequency SCREEN Zoom Depth More Depth settings Picture settings Gain Shift Clutter More settings Range Noise Limiter Alarms Hue Advance Speed Bottom box Signal level Video Return Return A-Scope Data Return Alarm settings Data on-screen Video setup Temp box Video on Fish alarm Temp graph Bottom alarm Bottom box Temp alarm Speed Return Return Return Figure 5: 957/958 echo sounder menu structure Page 10 491 Echo Sounder Operations Manual
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2Quick Start: Using the Echo Sounder Displaying the echo sounder’s picture . . . . 2-12 Using demo mode . . . . . . . . . . . . . . . . . . . . . . . . 2-14 Introducing the displayed information . . . . 2-15 Using automatic mode . . . . . . . . . . . . . . . . . . . . 2-16 Changing the frequency of echoes . . . . . . . . 2-17 Zooming in and out . . . . . . . . . . . . . . . . . . . . . . . 2-19 Setup functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 This chapter
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Displaying the echo sounder’s picture Once the navigator has been configured to operate with the 491, you’re ready to start viewing echo sounding data. To see the echo sounding screen at any time, press STAR from any screen. You’ll see live echoes moving across the screen. Depth marker Echo data Depth Scale and indicator Water temperature box Color bar Water temperature scale Frequency selection and indicator Depth box Navigation Lat/lon of Dist/brg Steering indicator Speed, course, and spee
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real-time echoes. For details, see “Reviewing past echoes using SoundTrac” starting on page 51. Depth marker Echo data Depth Scale and indicator Water temperature box Color bar Position Water marker temperature and scale indicator Depth box Lat/lon of Dist/brg to Steering indicator Speed, course, and speed position position through the water marker marker Figure 7: Illustrated SOUNDTRAC screen NOTES: All of the alarm messages always appear on all of the echo sounder’s screens. You won’t miss
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Using demo mode The echo sounder can be operated in “demo mode” for training and familiarization. Simulated echo data generated by the 491 will be displayed. To enter demo mode: 1. Press STAR several times to display the ECHO SOUNDER SETUP screen. 2. Press the CURSOR PAD down to select demo mode, then press EDIT. 3. Press the CURSOR PAD left or right to highlight “ON,” then press ACCEPT. While in demo mode, the word “Demo” appears in the upper right corner of the ECHO screen. To leave demo
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Introducing the displayed information The following information can be displayed on the ECHO screen. • echo sounder data Echo sounding • echo sounder frequency in use (50 or 200 kHz or both) • A-scope • automatic mode indicators (fishing or cruising) • manual operation indicator • echo colors in use (the “color bar” at the far left) • SoundTrac’s position marker for scrolling to old echoes • water-depth digital display (on the left side of the screen) Depth and • depth scale (on the righ
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Using automatic mode To operate the echo sounder automatically, just press AUTO. All of the 491’s adjustments will be set to produce a useful picture under most conditions. When you’re too busy to optimize the settings manually, the echo sounder can automatically set the optimal gain, clutter, and range settings, to show an excellent picture, from the surface to the bottom. When you select auto, the range setting may change from time to time to keep the seabed in view as the water depth c
