There is another way to do this. First, you have to find an "optimal depth" for it, then mark just about every place (or at least so that you can see the shape) where it rises above this. I've often used this for 400' when flying, to know where I can put deep buoys and where I must use the shallow ones.
This takes a bit of manual work, and is somewhat limited, but will give you an extra visible hint on how things look. Marking the tops and putting a depth text on the marker is helpful as well.
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