How to measure the fire level in the southeast? I can't use a feng shui compass. Thank you!

How to measure the fire level in the southeast? I can't use a feng shui compass. Thank you! -Take true north as 0 degrees, scale from left to right, and true south as 180 degrees. 180-22,5 =157,5 is the end of the position,142,5 is the beginning of the position.

But the scale on the mobile phone is from right to left, due south is 180 degrees, plus 22 and 5 degrees is the end of the position, plus 15 degrees, and 2 17 and 5 degrees is the starting point of the position.