Hi Master, sorry for the late reply as need to wait for my new compass to arrive and can only go to my new house during the weekends.
I stood at the A position to take a reading and it was off by about 20°, maybe due to the chair and table plus a dehumidifier at the green location.
I stand further from the Windows and the reading was off about 6°.
I stood at A in the bedroom and the reading was also about 6° off.
I stand outside the door, looking in and it was off by a lot (forgot to take photo for this).
Forgot to take the measurement when standing inside the door, looking outside (will do so this weekend and update).
Based on the current info, the drawing I have is correctly mapped for the directions?
Or it should be done using the lines that intercept at the centre of the house?
Thanks,
Tan