Check dive. First dive of guide or instructor with unknown people/ divers. In solid dive center is obligatory for all, without exception, regardless of their diving licenses and degrees.
The purpose of check dive is to control and evaluation the diving level and skills, equipment configuration control, aquatic environment habit after a long break and read the condition of the new location. Check dive is opportunity to evaluation of the correct buoyance control (service inflator, pressure equalization in the middle ear), re- inserting automat for the mouth, remove and cleaning the mask under water, accurate and slowly ascent and descent.
This is a good opportunity to remind and correct configuration. It is very important for divers who dive so far only in fresh water or salt water. The proper balance affects the safety of diving and air consumption (buoyancy compensation).
Overweight divers after returning from Egypt had been the cause of many accidents diving, as well as uncontrolled ascent after the training in the lakes.