Humminbird 987C SI COMBO User Manual
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LOWER RANGE
Lower Range sets the deepest depth range that
will be displayed. Automatic is the default setting. When in automatic mode, the lower
range will be adjusted by the unit to follow the bottom. Selecting a specific setting
locks the depth range into Manual mode. Use both Upper and Lower Range together
to view a specific depth range manually when looking for fish or bottom structure.
will be displayed in the lower right corner of the screen when you start manually
adjusting the Lower Range to indicate that you are in Manual mode.
range will be adjusted by the unit to follow the bottom. Selecting a specific setting
locks the depth range into Manual mode. Use both Upper and Lower Range together
to view a specific depth range manually when looking for fish or bottom structure.
will be displayed in the lower right corner of the screen when you start manually
adjusting the Lower Range to indicate that you are in Manual mode.
NOTE: A minimum distance of 10 feet will be maintained between the Upper and Lower
Range regardless of the settings entered manually.
Range regardless of the settings entered manually.
To adjust the Lower Range:
1. Highlight Lower Range on the Sonar X-Press™ Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the
Lower Range setting. (AUTO, 10 to 3000 feet, 3 to 930 meters [International
Models Only], Default = AUTO)
Models Only], Default = AUTO)
CHART SPEED
Chart Speed determines the speed at which the
sonar information moves across the display, and consequently the amount of detail
shown. A faster speed shows more information in the Sonar Views and is preferred by
most anglers; however, the sonar information moves across the display quickly. A
slower speed keeps the information on the display longer, but the bottom and fish
details become compressed and may be difficult to interpret. Regardless of the Chart
Speed setting, the RTS® Window will update at the maximum rate possible for the
depth conditions. Adjust Chart Speed to your personal preference.
shown. A faster speed shows more information in the Sonar Views and is preferred by
most anglers; however, the sonar information moves across the display quickly. A
slower speed keeps the information on the display longer, but the bottom and fish
details become compressed and may be difficult to interpret. Regardless of the Chart
Speed setting, the RTS® Window will update at the maximum rate possible for the
depth conditions. Adjust Chart Speed to your personal preference.
To adjust the Chart Speed:
1. Highlight Chart Speed on the Sonar X-Press™ Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the Chart
Speed setting. (1-10, where 1 = Slow, 10 = Fastest, Default = 5)
ZOOM LEVEL
(Sonar Zoom View, 981c SI models only)
Zoom Level sets the magnification level for the Sonar Zoom View, and is only available
on the Sonar X-Press™ Menu when the Sonar Zoom View is active on 981c models. Use
Zoom to increase the display resolution to separate sonar returns that are very close
together.
on the Sonar X-Press™ Menu when the Sonar Zoom View is active on 981c models. Use
Zoom to increase the display resolution to separate sonar returns that are very close
together.
To adjust the Zoom Level:
1. Highlight Zoom Level on the Sonar X-Press™ Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Zoom Level
setting for the Sonar Zoom View. (2x, 4x, 6x, 8x, Default = 2x)
NOTE: The Zoom Preview Box tracks the bottom and cannot be moved by the user.
For example, if you are fishing in 60 feet of water but are only interested in the first 30 feet
(surface to a depth of 30 feet) you should set the Lower Depth Range limit to 30. The display
will show the 0 to 30 foot range, allowing you to see a more detailed view than you would
will show the 0 to 30 foot range, allowing you to see a more detailed view than you would
see if the display went all the way to the bottom.
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