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Hello, I made a small PCB for the LSM303 electronic compass. The unit communicates with a I2C protocol and I made my one software functions to communicate with the unit what works great. Now, to get something useful out of the row data I have to use some math. Following the app notes of the LSM303 I have to calculate: Heading = arctan (Yh/Xh) Is there a mathematic library in SourceBoost. I work with a licend 6,95 Version. The other thing is that my browser (Chromium with Linux) want show the special signes from other threads correctly. My browser shows: ( for ( // ( for ) // ) for "; and so on .. It is difficult to read the code. Thanks Martin (