From a chart, select Options > Layers > Chart > Depth.

Depth Shading

Specifies an upper and lower depth to shade between.

Shallow Shading

Sets the shades from the shoreline to the specified depth.

Spot Depths

Turns on spot soundings and sets a dangerous depth. Spot depths that are equal to or more shallow than the dangerous depth are indicated by red text.

Fishing Contours

Sets the zoom level for a detailed view of bottom contours and depth soundings and simplifies map presentation for optimal use while fishing.