The ERDI Full Face Mask Course Manual provides the student with the skills and knowledge for the ERDI diver to utilize full face masks for emergency response diving. This course is designed to introduce the public safety diver to the issues, concerns and strategies necessary to dive a full face mask in a public safety diving operations setting. For the Emergency Response Diver, full face masks offer several distinct advantages over traditional second stage regulator assemblies, and in some cases, its use is required in environments such as contaminated water. *This is the same manual that is used for SDI Full Face Mask Diver.