Humminbird 981si User Manuals

Table of Contents

• How the 900 Series™ Works

  1
• Powering Up the Control Head

  23
• Side Imaging Sonar

  1
• What’s on the Sonar Display

  24
• DualBeam PLUS™ Sonar

  1
• Understanding Sonar History

  25
• GPS and Cartography (987c SI Combo models only)

  2
• Real Time Sonar (RTS®) Window

  25
• Multi-Media Card (MMC)/SD Slot

  2
• Sonar Bottom Presentation

  25
• Accessory Bus

  3
• 3 What’s on the Side Imaging Display

  27
• 4 Side Imaging Technology: How It Works

  28
• Side Imaging: On the Water Interpretation

  28
• Gimbal Mounting the Control Head

  5
• In-Dash Mounting the Control Head

  8
• Connecting the Control Head Power Cable to the Boat

  10
• POWER/LIGHT Key

  31
• 11 VIEW Key

  31
• MENU Key

  31
• Transom Transducer Installation

  12
• 4-WAY Cursor Control Key

  32
• Trolling Motor Transducer Installation

  16
• View Preset Keys

  32
• Test and Finish the Transducer Installation

  17
• EXIT Key

  32
• 18 INFO Key (987c SI Combo models only)

  32
• Stem Mounting with an Existing 1" - 14 Thread Stem

  18
• MARK/GOTO Key (987c SI Combo models only)

  33
• Access Under Mounting Location

  19
• ZOOM (+/- Key) (987c SI Combo models only)

  33
• No Access Under Mounting Location

  19
• Finish Routing the Cable and Check GPS Receiver Operation

  20
• Views and Readouts

  34
• 20 Sonar View

  34
• 22 Sonar Zoom View

  35
• Split Sonar View

  36
• Side Imaging View

  36
• Side/Sonar Combo View

  37
• Bird’s Eye View (987c SI Combo models only)

  38
• Chart/Bird’s Eye Combo View (987c SI Combo models only)

  38
• Lower Range

  52
• Chart View (987c SI Combo models only)

  39
• Chart Speed

  52
• Chart/Sonar Combo View (987c SI Combo models only)

  39
• Zoom Level (Sonar Zoom View, 981c SI models only)

  52
• Chart/Side Combo View (987c SI Combo models only)

  40
• Bottom Lock (Sonar Zoom View only)

  53
• Chart Orientation (987c SI Combo models only)

  40
• Bottom Range (Sonar Zoom View only, when Bottom Lock is On)

  53
• 40 Sonar Colors

  53
• Active Side

  54
• Waypoints, Routes and Tracks

  42
• Split Position

  54
• Save, Edit, or Delete a Waypoint

  42
• SI Side

  55
• Navigate to a Waypoint or Position

  43
• SI Sensitivity

  55
• Add a Waypoint Target or Trolling Grid

  44
• SI Range

  55
• Save, Edit or Delete a Route

  45
• Chart Speed

  55
• Save or Clear a Current Track

  45
• SI Colors

  56
• Edit, Delete or Hide Saved Tracks

  45
• Active Side

  57
• 47 Split Position

  57
• Normal Operation

  48
• Save Current Track

  57
• Simulator

  48
• Clear Current Track

  57
• System Status

  48
• Save Current Route (Only When Navigating)

  58
• Self Test

  48
• Skip Next Waypoint (Only When Navigating)

  58
• Accessory Test

  49
• Cancel Navigation (Only When Navigating)

  58
• GPS Diagnostic View (987c SI Combo models only)

  49
• Remove Target (Only If a Target is Active)

  58
• 50 Remove Grid (Only If a Grid is Active)

  59
• Active Side

  50
• Split Position

  50
• Beam Select

  60
• Sensitivity

  51
• Side View Frequency

  60
• Upper Range (Advanced, Sonar, Split Sonar and Active Sonar Side Views only)

  51
• Fish ID+™

  60
• Fish ID Sensitivity

  61
• Spot Soundings

  70
• Real Time Sonar (RTS®) Window

  61
• Shaded Depth

  70
• Bottom View

  62
• Set Simulation Position (Advanced)

  70
• Zoom Width (Sonar Zoom View only)

  62
• Set Map Offset (Advanced)

  71
• 50 kHz Sensitivity (Advanced)

  63
• Clear Map Offset (Advanced)

  71
• Depth Lines (Advanced)

  63
• Surface Clutter (Advanced)

  63
• Depth Alarm

  72
• Noise Filter (Advanced)

  63
• Fish ID Alarm

  72
• Max Depth (Advanced)

  64
• Low Battery Alarm

  72
• Water Type (Advanced)

  64
• Temp Alarm

  72
• Color Bar

  64
• Off Course Alarm (987c SI Combo models only)

  73
• Temperature Graph (Sonar View only, with Temperature input)

  65
• Arrival Alarm (987c SI Combo models only)

  73
• 65 Drift Alarm (987c SI Combo models only)

  73
• Tracks

  66
• Alarm Tone

  74
• Waypoints

  66
• Routes

  66
• Units - Depth

  75
• Chart Orientation

  67
• Units - Temp (International only)

  75
• North Reference

  67
• Units - Distance (With Speed Input only)

  75
• Trolling Grid Rotation

  67
• Units - Speed (With Speed Input only)

  75
• Trackpoint Interval

  67
• User Mode

  76
• Track Min Distance (Advanced)

  68
• Language (International only)

  76
• Map Datum (Advanced)

  68
• Triplog Reset (With Speed Input only)

  76
• Export All Nav Data (Advanced)

  68
• Restore Defaults

  76
• Delete All Nav Data (Advanced)

  68
• Select Readouts (Advanced)

  77
• 69 Depth Offset (Advanced)

  78
• Chart Detail Level

  69
• Temp Offset (Advanced)

  78
• Map Borders

  69
• Speed Calibration (Advanced, with Speed Paddlewheel only)

  79
• Lat/Lon Grid

  70
• Local Time Zone (Advanced, 987c SI Combo models only)

  79
• Daylight Saving Time (Advanced, 987c SI Combo models only)

  79
• Position Format (Advanced, 987c SI Combo models only)

  79
• Time Format (Advanced, 987c SI Combo models only, International only)

  80
• Date Format (Advanced, 987c SI Combo models only, International only)

  80
• NMEA Output (Advanced)

  80
• Sonar (987c SI Combo models only)

  81
• 900 Series™ Doesn’t Power Up

  82
• 900 Series™ Defaults to Simulator with a Transducer Attached

  82
• Display Problems

  83
• Finding the Cause of Noise

  84