I think some do and some don't. It may just depend on how you take it and who is offering it. I just remember some saying they didn't get credit for taking it online. Like the link that W9BU posted it says "If you check the box, you may be able to register with the NWS after passing the course. Your local NWS Warning Coordination Meteorologist will determine if there is additional training on other weather hazards, such as heavy snow, ice storms, floods, etc., and their reporting that must be completed through local spotter training." So that means even though you take it online you may still have to attend a class in order to get credit and be registered with NWS.