NorthStar Navigation Echo Sounder 491 マニュアル

目次

• 1 Welcome

  5
  • Welcome to the Northstar 491

    6
  • Using this manual

    6
  • Technical support

    8
  • How echo sounding works

    9
  • Powering the 491 on and off

    11
  • Setting up the 491

    11
• 2 Quick Start: Using the Echo Sounder

  15
  • Displaying the echo sounder’s picture

    16
  • Using demo mode

    18
  • Introducing the displayed information

    19
  • Using automatic mode

    20
  • Changing the frequency of echoes

    21
  • Zooming in and out

    23
  • Setup functions

    26
• 3 Adjusting the Echo Sounder Picture

  31
  • The picture menu

    32
  • Adjusting the gain (strong echoes)

    32
  • Adjusting the clutter (weak echoes)

    33
  • Adjusting the signal level (weak echoes)

    34
  • Suppressing interference (the noise limiter)

    35
  • Selecting the color bar (hue) and white level

    36
• 4 Understanding Depth Settings

  39
  • Viewing the seabed depth

    40
  • Viewing the depth marker

    40
  • Changing the depth settings

    40
  • Setting the picture’s shift (starting depth)

    41
  • Setting the picture’s range

    42
• 5 Other Functions: Using the MORE key

  45
  • Using the MORE key

    46
  • Changing the advance speed

    46
  • Displaying the A-scope

    47
  • Setting the ECHO screen data

    48
  • Introducing snapshots

    50
  • Setting up the video image overlay

    53
• 6 Reviewing past echoes using SoundTrac

  55
  • Viewing past echoes using SoundTrac

    56
  • Marking fish as waypoints

    57
  • Navigating to a past echo position

    57
• 7 Setting the Alarms

  59
  • Understanding the alarms

    60
  • Setting the fish alarm

    60
  • Setting the bottom alarm

    62
  • Setting the temperature alarm

    64
• 8 Troubleshooting 491 Operations

  67
  • Troubleshooting the echo sounder

    68
  • Checking the transducer

    69
• A 491 Features and Specifications

  71
• Glossary

  75