Sports I is about equivalent to SSI/PADI regular OW diver (can only dive with dive leader or higher)
SSI, PADI, NAUI and others in the US have "OW" as being qualified to dive without supervision (e.g. no "dive leader" or "dive mater" required.)
Now whether many people who actually finish that class ARE qualified to dive unsupervised at the conclusion of the class is another matter!