By online do you actually mean on the web or generally computer based.
We have one called "The GD&T Trainer PE v3.2" but I haven't actually used it, it's mainly used for interns. My link to it isn't working so I can't give more info, I think I may have posted about it before though if you can find that post.
ASME is actually now offering training to the latest standard revision. I am not sure who is teaching it or who developed the training material but I wouldn't be surprised if Al Newman or Alex Krulikowski or one of the other Y14.5 committee members is involved with it. See the link below.