It sure does look like a byte shift. For reading EEPROM/RAM locations, I believe it is just sending back an 8 bit byte. If you choose to read raw magnetometer data rather than computed heading, that's where the 2's complement comes into play. I haven't got that far yet, and FWIW, plan to read computed heading. Thought it would be a good simple test to just try to read an write some simple values to the unit before trying to take measurements....

The delay I put in is consdierbaly longer than the delays mentioned in the data sheet. From my understanding og the I2C protocol, the extra wait time should not be a factor. Whether or not it "bugs" the compass processing I can't see. Can reduce the wait time to the recommended 70 usecs and see if that changes anything.

If else fails, I'll take it to work and watch the transaction on a digital storage scope and see what's occuring.