Hardback Waterproof Edition. The Handbook not only contains the US Navy Decompression Tables but also the Recompression Chamber Operator’s Handbook. It is pocket size, printed on waterproof/tear proof pages, and is easily referenced. Used internationally by recreational, commercial, and military divers because of its authoritative and approved procedures, it contains revision 6 decompression tables and techniques for avoiding decompression sickness. This durable handbook is a must for all divers and chamber operators.