buy dive computer and dive camera

[DeepDish]

Yes, perfect, i also use Casio Z77 + EWC-11, and i agree about not using the built in flash.

[Lenard Aaren]

Many dive computers are configured for Nitrox which allows the diver to use air or Enriched Air Nitrox. These dive computers offer all the same features of the air computers, but can easily be programmed for whatever mixture of Nitrox the diver is using. "All other conditions being equal, a diver on Nitrox 36 will consume about 12 percent less gas than a diver on normal air." - According to Scuba Lab.