Originally Posted by timecop
You're reading it wrong.
But after all, it's just i2c bus so you can connect many things to it at once. You can solder BMP085 breakout to BMP pads, and compass breakout to the C/D/GND pads on the bottom of the board.
I am a real newbie, so sorry if I ask a lot of explanation.
Soldering BMP085 to FF is OK (in theory …)
If I add HMC5883L breakout, I read I should connect it in this way: SCL (C), SDA (D), GND, and 3V pads. But where is the 3V pad?