Humminbird ] 981 User Manual
Page 5
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TABLE OF CONTENTS
Fish ID Sensitivity...................................................................................................................... 61
Real Time Sonar (RTS®) Window ........................................................................................ 61
Bottom View.............................................................................................................................. 62
Zoom Width
(Sonar Zoom View only)
.................................................................................... 62
50 kHz Sensitivity
(Advanced)
................................................................................................ 63
Depth Lines
(Advanced)
............................................................................................................ 63
Surface Clutter
(Advanced)
...................................................................................................... 63
Noise Filter
(Advanced)
............................................................................................................ 63
Max Depth
(Advanced)
............................................................................................................ 64
Water Type
(Advanced)
............................................................................................................ 64
Color Bar...................................................................................................................................... 64
Temperature Graph
(Sonar View only, with Temperature input)
...................................... 65
Navigation Menu Tab
(987c SI Combo models only)
65
Tracks............................................................................................................................................ 66
Waypoints .................................................................................................................................. 66
Routes ........................................................................................................................................ 66
Chart Orientation .................................................................................................................... 67
North Reference........................................................................................................................ 67
Trolling Grid Rotation.............................................................................................................. 67
Trackpoint Interval.................................................................................................................... 67
Track Min Distance
(Advanced)
.............................................................................................. 68
Map Datum
(Advanced)
.......................................................................................................... 68
Export All Nav Data
(Advanced)
............................................................................................ 68
Delete All Nav Data
(Advanced)
............................................................................................ 68
Chart Menu Tab
(987c SI Combo models only)
69
Chart Detail Level .................................................................................................................... 69
Map Borders .............................................................................................................................. 69
Lat/Lon Grid .............................................................................................................................. 70
Spot Soundings ........................................................................................................................ 70
Shaded Depth............................................................................................................................ 70
Set Simulation Position
(Advanced)
.................................................................................... 70
Set Map Offset
(Advanced)
...................................................................................................... 71
Clear Map Offset
(Advanced)
.................................................................................................. 71
Alarms Menu Tab
71
Depth Alarm .............................................................................................................................. 72
Fish ID Alarm.............................................................................................................................. 72
Low Battery Alarm.................................................................................................................... 72
Temp Alarm ................................................................................................................................ 72
Off Course Alarm
(987c SI Combo models only)
.................................................................. 73
Arrival Alarm
(987c SI Combo models only)
.......................................................................... 73
Drift Alarm
(987c SI Combo models only)
.............................................................................. 73
Alarm Tone.................................................................................................................................. 74
Setup Menu Tab
74
Units - Depth .............................................................................................................................. 75
Units - Temp
(International only)
............................................................................................ 75
Units - Distance
(With Speed Input only)
.............................................................................. 75
Units - Speed
(With Speed Input only)
.................................................................................... 75
User Mode .................................................................................................................................. 76
Language
(International only)
..................................................................................................76
Triplog Reset
(With Speed Input only)
.................................................................................... 76
Restore Defaults........................................................................................................................ 76
Select Readouts
(Advanced)
.................................................................................................... 77
Depth Offset
(Advanced)
.......................................................................................................... 78
Temp Offset
(Advanced)
.......................................................................................................... 78
Speed Calibration
(Advanced, with Speed Paddlewheel only)
.......................................... 79
Local Time Zone
(Advanced, 987c SI Combo models only)
................................................ 79
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