Although it is one of the most important factors to take into account, a wave's height is not the only factor that determines how dangerous it is. Generally speaking, waves that are 6 feet (2 meters) or higher can be deemed hazardous for leisure activities like swimming, surfing, or boating. However, other elements like the depth of the water, the space between waves, the speed of the current, and the weather can also have a big impact on how dangerous a wave is. Additionally, due to variations in water and air temperatures, shoreline configurations, and regional wind patterns, a wave that is 6 feet high in one location might not be as dangerous as a wave that is 6 feet high in another location.

Also, using the minimum 30 percent wave height to boat length, if your boat is 40 feet long, then the wave-height danger zone starts at waves 12 feet high (40 x 30). A wave 12 feet high could knock down a boat 40 feet long if the boat is caught somewhere near the beam onto the wave as it breaks.

When participating in activities that involve water, it's crucial to be constantly cautious and aware of the circumstances. It is advised to ask for guidance from local authorities or lifeguards and to always wear the proper safety equipment, such as a life jacket or a flotation device. In case of an emergency, it is also a good idea to be familiar with the fundamentals of water safety and first aid.
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