hi i dont know about your phone but on my galaxy ace there is an option to set it to true north or mag north depending on what you require make sure the compass is calibrated ie when the compass is on the screen move it in a figure of eight and wait for the pointer to settle then mark your bearing i use a stick light to place on the ground at north,south east and west and roughly align the mount to them then adjust using the polar scope till im spot on seems to work pretty well for me..(battery opperated sticklights £1ea Poundland).