Noise Filter (Advanced); Max Depth (Advanced) - Humminbird 917C Installation And Operation Manual

Noise Filter adjusts the sonar Noise Filter to limit interference on the display
from sources such as your boat engine, turbulence, or other sonar devices.
The Noise Filter menu choice is available when User Mode is set to
Advanced (see Setup Menu Tab: User Mode).
NOTE: The Off setting removes all filtering; Low, Medium and High settings add
progressive filtering of the sonar returns. In some deep water situations, the High
setting may actually make it harder for the control head to find the bottom.
To change the Noise Filter setting:
1. Make sure you are in Advanced User Mode, then highlight Noise
Filter on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change
the Noise Filter setting. (Off, Low, Medium, High 1, High 2, High 3,
Default = Low)
Noise Filter
(Advanced)
Max Depth adjusts the maximum depth of operation. The performance of
your 900 Series™ can be tuned to the maximum depth you will be fishing in
by setting the Max Depth. When a maximum depth is set, your 900 Series™
will not attempt to acquire sonar data below that depth, thus increasing
overall performance. When Max Depth is set to Auto, the 900 Series™ will
acquire bottom readings as needed (within the capacity of the unit).
If the bottom is deeper than the Max Depth setting, the digital depth readout
will flash, indicating that the 900 Series™ cannot locate the bottom. The
Max Depth menu choice is available when User Mode is set to Advanced
(see Setup Menu Tab: User Mode).
To change the Max Depth setting:
1. Make sure you are in Advanced User Mode, then highlight Max
Depth on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the
Max Depth setting. (AUTO, 10 to 1500 feet; 3 to 500 meters
[International models only], Default = AUTO)
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Max Depth
(Advanced)