I was not aware that it was a requirement beyond the obvious. There is nothing unique or unusual in the east coast boat dives vs west coast that would mandate a computer.Wow, we just got back from Bonaire yesterday and I was already looking into Bonaire East Coast Diving for next time. I'm definitely going to the East Coast! My question was, why do they required a dive computer?
A few things to consider in boat vs shore east coast dives are that with Bas you dive your abilities and air consumption. There is no time limit for your dive. The boat dives are time limited.
There are a lot more dive sites available with Bas.
For basically the same money, you get a private dive guide and a dive tailored to you.