iRegattaLights app for iPhone and iPad
iRegattaLights is an overview of lights and shapes use at sea to signal the type of craft and activity, as described in the collision regulations.
If you see a light combination at sea at night, you can find it in the "Night" table and click it to see a 3D view of a ship displaying the lights and a description of the rule.
At daytime special ships are displaying shapes instead of lights. You can find them in the "Day" table and click it to see a 3D view of a ship displaying the shapes and a description of the rule.