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Firstly, welcome! Can you post, or make available a sample of your data? You gridded data is points, and have the default style, hence the black. If you really want to view gridded ie point data, style the points, other wise transform the grid to a raster. The raster can be relief shaded, blended with mean slope or other derivatives. Styling rasters is straight forward, read the manual, watch the videos. Search the manual, and have a look at the ever useful videos. Here's the process described above If you are running M9, you cannot inspect a single pixel for depth value. Creating isobaths from the raster is quick, really quick.
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