I help with Melbourne Perl Mongers.
I spend an awful lot of time talking about Perl, and have had my picture in the Australian newspapers with a camel. That's rather scary.
As such, I've written SCUBA::Table::NoDeco, appearing soon at a CPAN mirror near you. Make sure you read the disclaimer before use and verify the final results by hand. I wouldn't trust my life to a 0.01 release module.
Once I had the module working, creating an on-line dive planner was easy. Currently only the SSI tables are loaded. I do have a number of other tables availale, but entering the tables is a time-consuming process, so patches are very welcome.