Whiteline
The Fishfinder 100 Blue can help you to determine if the bottom is
hard or soft. When the sonar soundwaves are reflected back by the bottom, a hard bottom will return a stronger signal than a soft bottom. The stronger the bottom return, the wider the bottom layer is displayed. The unit uses the Whiteline function to make this bottom layer information easier to distinguish.
When viewing the display without Whiteline active, the bottom return is black. While you can make some determination of the bottom type, the black return makes this more difficult. With the Whiteline active, the bottom return appears layered in shades of gray and black, which makes determining the bottom type easier and more reliable. Example 3 shows the bottom return with and without the Whiteline activated.
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| Whiteline | |
| Whiteline Turned Off | Whiteline Activated | ||
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| Example 2. | |
On the Water
Understanding the Chart
Whiteline can also help you to determine the type of bottom structure that is displayed on the chart. By determining the hardness of the structure you can make a better informed decision as to the type of structure.
Structure is hard, probably a | Structure is soft, probably a |
rock or stump | mud pile |
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