Do the calculations: A2-A1 and B2+B1
If A2-A1 is within 180°±20″and B2+B1 is within
360°±20″, adjustment is unnecessary.
Example:A2-A1 (Horizontal angle)
=198° 34' 20"- 18° 34' 00"
=180° 00' 20"
B2+B1 (Vertical angle)
=269° 30' 00" + 90° 30' 20"
=360° 00' 20"