This 95 page manual is required for your Sidemount Diver and/or Tec Sidemount Diver Specialty. Includes three knowledge reviews which you will go over with an instructor during your course.
Excerpt from the manual:
"You're probably aware that sidemount diving is diving with one or, more commonly, two cylinders along your side instead of on your back. If you've yet to try it, sidemount may look awkward, yet it is surprisingly comfortable and balanced in the water. Sidemount originated with cave diving, but has moved into mainstream recreational diving"