Lowrance 5 HDI Operator's Manual page 31

Fishing range
Select a range of depths between which Navionics fills with a
different color.
This allows you to highlight a specific range of depths for fishing
purposes. The range is only as accurate as the underlying chart data,
meaning that if the chart only contains 5 meter intervals for contour
lines, the shading is rounded to the nearest available contour line.
No Depth highlight range Depth highlight range: 6 m - 12 m
Shallow water highlight
Highlights areas of shallow water.
This allows you to highlight areas of water between 0 and the
selected depth (up to 10 meters/30 feet).
No shallow water highlighted Shallow water highlight: 0 m - 3 m
Presentation type
Provides marine charting information such as symbols, colors of the
navigation chart and wording for either International or U.S.
presentation types.
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Charts | Hook² Series Operator Manual