Display Options Adjust how raster layers such as bathymetry layers are drawn on the map. Options Option Description Theme A theme sets the colors used in the scale. All raster layers are visualized using the same theme. Default themes are available but specific themes can be shared between organizations, project or for personal use. A user can select the available theme from the drop-down list. The theme can be modified in a separate dialogue. SeeĀ  Manage Themes. Color scale Fixed Use the depth values provided in the theme. Dynamic Use the min/max values in the viewable part of the map. Note: The depth may not be consistent when zooming in/out, but the dynamic color scale gives better depth contrast. Time slider A bathymetry layer can have multiple versions from different dates. The (optional) slider selects a version based on the date of the file version.