Lesson 2: Site Conditions
heavy surf
Lesson Objectives
After this lesson, you will be able to:
  • Identify the major force that causes tidal changes.
  • Explain how tides affect a dive site.
  • Identify the major cause of waves.
  • Explain the difference between swells, surf, and surge.
  • List three types of currents, and identify them in the open water.
  • State the appropriate procedures for diving in currents.
  • List three factors that can reduce visibility.
  • Explain how thermoclines and upwellings affect water temperature.
  • Determine the bottom composition and contours of a dive site by observing the nearby shore.