Final answer:
Small boats need to wait for slack water, the period around the change between high tide and low tide, to navigate swift tidal currents safely. Considering wind direction and velocity relative to the water is also crucial for navigation, especially for sailboats. Tide tables, specific to each location, are essential for safe sailing. option 1 2 are correct
Step-by-step explanation:
Small boats need to wait for slack water, which is the short period when the water is completely unstressed between tides, and the currents are the weakest. This occurs briefly before the water starts moving back in the other direction, during the change between high tide and low tide. It's a safer time to navigate swift tidal currents, as the water is not moving too strongly in any direction, reducing the risk of being swept away by the current.
When navigating tidal currents, the wind direction can also play a significant role. Sailboats, in particular, need to consider the velocity of the wind relative to the water to adjust their sailing strategy and course to reach their destination efficiently without being pushed off course by currents or wind.
Safety and efficiency in navigation also depend on understanding tide tables, which are specific to each location due to the complex interaction of factors such as land masses, ocean depths, and the rotation of Earth affecting tidal movements. option 1 2 are correct