# Sensing in Inland Waters to Promote Safe Navigation: A Case Study in the Aveiro's Lagoon
## 4 Survey and in-Context Interviews
### Outdoor Color and UI Interaction Validation  
Based on the color palette initially analyzed under the influence of direct sunlight, the participants checked which colors they thought would be most suitable for the system. During the interviews with participants (N = 11), six participants (n = 6) chose palette 6 (Figure 17) for the data-sharing system, while the remaining three (n = 3) chose palette 5 (Figure 17). Only two individuals (n = 2) were undecided between palettes 5 and 6. These colors will be incorporated not only into the visual elements of the interface but also will form the basis for the map style and user icons registered in the system.  
Thus, palette number 6 was chosen to initiate the prototyping and harmonization of the data-sharing system's design. These colors will be incorporated not only into the visual elements of the interface but also will form the basis of the map style and user icons used in the system.  
Furthermore, this evaluation provided insights into interface design preferences and necessary data to be shared through the maritime data sharing system. In line with the functional requirements outlined by users in the previous section and based on the presented interfaces, most participants (N = 11) preferred the interface shown previously in Figure 4.  
This evaluation provided insights concerning interface design preferences and necessary data to share in the maritime system, in line with the functional requirements outlined by users in the previous section and based on the presented interfaces.  
Participant 6 commented that the interface effectively groups all necessary information and allows for easy access to supplementary trip information. Participant 3 emphasized the importance of the information not obstructing their route, while Participant 4 suggested that the interface should include symbols or icons for more direct access to information. When discussing data sharing in an anonymous or public format within this interface, Participant 7 emphasized the importance of public sharing to prevent the spread of 'fake news' or false content.  
It is worth noting that some participants also contributed to enhancing the interface, based on solutions identified earlier on this article (Benchmarking section). Participant 3 suggested, \"Having the height of bridges present in the Ria\"; Participant 11 proposed that \"The interface should display depth as the first data point, considering that this system will be used in inland water scenarios\"; Participant 8 recommended that \"I should be able to observe other users around me with simpler and more direct information, without having to click on multiple buttons\"; Participant 6 suggested that \"I should have the functionality to click on areas in the Ria that allow me to obtain tidal height information.\"  
In addition, involving stakeholders from the maritime community ensures that the developed systems are not only technologically robust but also practical and usable in  
Figure 17: The most predominant palette choices by participants.  
real-world scenarios. By seeking input from skippers, captains, sailors, and fishermen, valuable perspectives on the challenges and requirements inherent in maritime activities were gained, enabling to effectively tailor the solutions to address sailors' specific needs.  
In conclusion, the findings highlight the importance of adopting a user-centered approach in designing and developing maritime data sharing systems. By involving end-users throughout the process, systems that enhance situational awareness can be created, improving decision-making, and ultimately contributing to safer and more efficient maritime operations. This approach ensures that the resulting systems are technically sound and responsive to the needs of those who rely on them at sea. It is collaborative and iterative, promoting effective communication and problem-solving.