SDI Open Water Scuba Diver Practice Exam 2025 - Free Scuba Diver Practice Questions and Study Guide

The Recreational Dive Planner (RDP) is primarily used to plan dives and ensure that divers stay within safe limits, specifically the no-decompression limits. This planning tool helps divers understand how long they can stay at a given depth without the risk of decompression sickness. By providing a clear table of permissible dive depths and times, the RDP allows divers to organize their dive schedules effectively and safely, minimizing the risks associated with nitrogen absorption in the body.

While other choices mention important aspects related to diving, they do not capture the primary function of the RDP. Calculating dive travel time, adjusting buoyancy, and determining underwater routes are important elements of a dive but fall outside the core purpose of the RDP. The RDP’s main goal is focused on dive planning and safety in relation to depth and time, ensuring that divers can enjoy their experience while minimizing health risks.