I just bought two Atom 1.0 from the LDS. But I found the altitude displays of the two PDC are different, one shows "SEA", and another shows "LEV2", the later is incorrect. Is this a defect? If not, what is the solution? Another problem is temprature display, one shows 30C, another shows 33C at the same time, but the acture room temprature is about 26C something. Again, is this a defect?