DIY Moire Pattern Device Replicates Ship Guidance System

Replicating Moire Guidance

Inspired by a video discussing "Inogon" lights, a system used to guide ships, a maker constructed a physical model demonstrating the Moire pattern effect. The project followed the specifications outlined in a patent for such devices, particularly regarding the ratio of pitch spacing to dark band width and the number of excess bands.

Device Functionality

The constructed device, made using Inkscape and laser-cutting, successfully produced the intended visual effect when illuminated. From various angles, the Moire patterns provided clear directional cues, confirming the system's ability to intuitively guide a vehicle. The creator noted that minor circular effects observed were due to close viewing distance, which would disappear at typical operational distances.

Practicality and Limitations

While the Moire system effectively provides precise guidance, the creator questioned its overall practicality for modern harbor navigation. The system dictates a very narrow, "platonically perfect" course, which may not be ideal for harbors that typically offer a wider safe channel. This precision could lead to increased fuel consumption and higher demands on concentration for navigators, especially when contending with factors like currents or other vessels.

Alternative Guidance Systems

The creator contrasted the Moire system with a simpler three-light guidance method observed in Newcastle. This alternative system uses the relative position of a top lamp between two lower lamps to indicate a safe course, a boundary, or an off-course condition. This simpler approach offers a broader safe area, which may be more forgiving and practical in complex real-world maritime environments.