What limit should you follow while planning a deep dive?

When planning a deep dive, it is essential to adhere to the maximum depth that you are trained for. This ensures that you operate within the limits of your training, skills, and experience, which are crucial for maintaining safety underwater. Deep dives can introduce significant risks such as narcosis and oxygen toxicity, which vary depending on depth and duration. Following the maximum depth limit you have been trained for helps prevent unintentional exposure to these risks.

The other choices do not provide a solid foundation for safety. Choosing the deepest dive your buddy has done might expose you to greater risks without the assurance of your own competencies at such depths. Considering the average depth of local dives may not account for specific conditions that impact your safety at deeper levels. The depth limit of the dive site could vary and might not reflect personal limits, therefore, relying solely on site limits without considering personal training can compromise diver safety.

In summary, sticking to the maximum depth you are trained for is critical to ensuring safe and enjoyable diving experiences while minimizing the risks associated with deep diving.