Context
Use this function to select what kind of echogram you wish to see in the current (active) view.
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Surface A Surface echogram is mainly used when you wish to look at the entire water column starting from the sea surface and down to the sea
bottom. Since this echogram is referenced to the sea surface, the sea bottom contour will vary with the actual depth.
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Bottom A Bottom echogram is mainly used when you want to examine the echoes from fish close to the sea bottom. Since this echogram is referenced to the sea bottom, the sea surface will vary with the actual depth, while the bottom is
drawn flat.
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