Fore and back bearing

The bearing of a line measured in the direction of the progress of survey is called the ‘fore bearing’ FB of the line. The bearing of the line measured in the direction opposite to the survey is called the ‘back bearing’ BB of the line. Technical Data used in the field explained in civil surveyor course in rawalpindi.in the whole circle system ,the difference between the FB and BB should exactly 180 degree remember the following relation’ BB=FB=+-180 degree. use the positive sign when FB is less than 180 degree and then negative when it is more than 180 degree.

In the quadrantal bearing ‘i.e.’ reduced bearing system, the FB and BB are numerically equal but the quadrants are just opposite. The horizontal angle between the magnetic meridian is known as ‘magnetic declination’. Some more details of civil surveyor course in rawalpindi are as under. When the north end of the magnetic needle is pointed towards the west side of the true meridian, the position is termed ‘declination East’.

Lines passing through points of equal declination are known as ‘isogonic’ lines. the line passing through points of zero declination is said to be the agonic line. The survey of Pakistan department has prepared a map of Pakistan which the isogonic and agonic lines are shown properly as a guideline to conduct the compass survey in different parts of the country. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join civil surveyor course in islamabad.

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