> For the complete documentation index, see [llms.txt](https://njord.gitbook.io/physical-competition-2023/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://njord.gitbook.io/physical-competition-2023/6-task-descriptions/6.2-sea-markers.md).

# 6.2 Sea Markers

The competition course will mainly consist of floating buoys and a few cardinal marks. These elements are used to guide the ASVs through the course and to indicate the path they should follow. The teams' vessel must be equipped with sensors and navigation systems that can detect and interpret the markers, allowing the vessel to navigate around or through the obstacle. 

**Buoys:** 

The floating buoys will be of different colors, with each color indicating a specific instruction or direction for the ASVs. They will be placed strategically to define the course paths and objectives.

<figure><img src="/files/sYSPddS7w2PGJUhRpHh2" alt=""><figcaption></figcaption></figure>

**Cardinal marks:**&#x20;

Cardinal marks are used to indicate the cardinal directions (north, south, east, and west) and to provide a reference point for the ASVs. These marks will be placed at strategic locations along the course to help the ASVs navigate and stay on track.

<figure><img src="/files/MsLLX42D944H7rhsA4Y5" alt=""><figcaption><p>Cardinal marks that will be used during the competition</p></figcaption></figure>

**Specifications:**

The sea markers have the following specifications:

<table data-full-width="true"><thead><tr><th width="149">Marker type </th><th width="166">Colour</th><th width="294">Meaning</th><th>Additional comments</th></tr></thead><tbody><tr><td>Navigation Red</td><td>RAL3001 Signal Red</td><td>Keep mark on port side while navigating</td><td>None</td></tr><tr><td>Navigation Green</td><td>Neon Green</td><td>Keep mark on starboard side while navigating</td><td>None</td></tr><tr><td>Cardinal North</td><td>RAL9005 Black &#x26; RAL1003 Yellow</td><td>Passing on North side of mark</td><td>Black and yellow marks are 30 cm high from waterline</td></tr><tr><td>Cardinal East</td><td>RAL9005 Black &#x26; RAL1003 Yellow</td><td>Passing on East side of mark</td><td>Black and yellow marks are 20 cm high from waterline</td></tr><tr><td>Cardinal South</td><td>RAL9005 Black &#x26; RAL1003 Yellow</td><td>Passing on South side of mark</td><td>Black and yellow marks are 20 cm high from waterline</td></tr><tr><td>Cardinal West</td><td>RAL9005 Black &#x26; RAL1003 Yellow</td><td>Passing on West side of mark</td><td>Black and yellow marks are 20 cm high from waterline</td></tr></tbody></table>

The sea markers have the following dimensions:

<table><thead><tr><th width="210">Part</th><th width="221.33333333333331" align="center">Diameter</th><th align="center">Height</th></tr></thead><tbody><tr><td>Bouy</td><td align="center">40 cm</td><td align="center">40 cm (20 cm above waterline)</td></tr><tr><td>Cilindrical mark</td><td align="center">14 cm</td><td align="center">40 cm</td></tr><tr><td>Total from waterline</td><td align="center">-</td><td align="center">60 cm</td></tr></tbody></table>

A dataset of photos of the markers (Red, Green, East, West) is provided by a Google drive link.


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