2 x iridium possible lockups after consci ---> quit ---> bad char received ---> send *.tbd. Happened during testing and on deployment. Haven't seen it since. Deployment went well except m_pressure showed strong drifting during surfacing and during segment. During test missions initially m_pressure drifted deeper over the course of segment from about 1 m at surface to about 3.5 at surface. Eventually I zero'd the pressure right after a surfacing. This would be the important time to have it zero'ed since that is what is bases surfacing completion as. Since deployment it appears to be drifting less overall. Based on surfacings it appears to be drifting upward (shallower) over the course of a surfacing by about 0 to 4 m. Average < 1 m. At call in its usually reading < .5 m which is good.