ShipIntel gives you the option of three different Map Styles.
Click on the Styles and Layers Button in your upper right corner of the map to get the different options on your map style. You will se that you have the option between three different styles; Dark, Light, or Satellite.
Click on either one to change your style. In addition you can elect if you prefer to see the map in a Globe style, or in a Standard Mercator projection.
Please note that if you choose the Satellite style you will not be able to add the other map layers below.