This is the PADI Imperial RDP Recreational Dive Planner For Scuba Diving Features: Imperial version Durable plastic and waterproof Hole-punched for use on a lanyard Always a reliable source for safe and conservative dive planning Model#60099 The Recreational Dive Planner Table (RDP) is in feet of water (imperial version) and informs the new diver of safe depth and time limitations for recreational diving. Even if you dive a computer you should always have a set of tables along as a back-up in case your computer fails and you want to continue diving safely. The RDP is a great item for your Save-A-Dive Kit.