Hi Ryan, > I just want to start the tracer from my initialFile at an advanced > timestep. I can see your frustration, and there may be a proper way to do what you want. However, as a work around, why not set chkptFreq to 2000*dt and restart the gcm after spin up with nIter0=2000? Cheers, Jody -- Jody Klymak http://web.uvic.ca/~jklymak/