You are searching on the subject of the Recreational Dive Planner also known as the RDP. You found a good source for that information here at Divetalking.

During this Session, you will learn about the various ways to use the Diving Science & Technology Corp Recreational dive tables supported by PADI. From here on the DSAT Recreational dive tables sanctioned by PADI will be called, RDP.

Proper safety procedures and equipment should be utilized at all times when entering the water. We recommend acquiring the proper training from a local dive shop and experience before attempting to use any of the detailed information provided here at Divetalking.com. Never attempt to teach yourself or others what you learn using from this site. Improper execution could lead to injury or death.

The RDP is based on many years of research and factors, averaging the best numbers, with weight  towards safety to calculate times. The RDP …