What I want in a dive shop.

[jasondbaker]

I want a customer accessible gas filling system.  The dive shop would secure the gas filling system by keycard or pincode access.  Customers could fill their tanks 24x7.  The system would keep track of how much gas was delivered and would automatically bill the customer's credit card.  Customers would be required to take a gas filling course before being allowed access to the system.  I would be willing to pay more for these fills due to the convenience.