Thanks everybody for all of the input (although the thread seemed to start moving off subject). My last DOT recert physical only seemed concerned that my avg sleep was over 6 hours per night regardless of schedule (lord knows my schedule is messed up). I think that the combined data of the machines ...

I'm a trucker so I fall under DOT (dept of transportation) rules. As a trucker I travel a lot and have considered a 2nd cpap unit for taking on the road. Is anyone doing this or have any idea if compliance would be affected by using 2 separate machines data? If this subject is already been addressed...