What is the standard tipping procedure for diving in Cozumel?

A good rule of thumb is $5 to $10 per tank per diver. In other words, if you do a 2-tank dive, an appropriate tip would be $10 to $20 for each diver. The crew pools the tips, so no need to tip them each individually.  Tipping daily or at the end of the week is also a personal preference. We try to keep you with the same crew all week, but sometimes this isn’t possible due to crew off days, turnover in divers, crew illness, etc. If you decide to tip at the end of the week, and had the same crew…then give it to the dive master or the captain. If you had different crew members throughout the week, then it’s usually best to give it to Kami and she will see that it is divided up appropriately.  Another excellent article on tipping can be found here