After plotting

During survey

During plotting

Before plotting

Included angle method

Paper protractor method

Parallel meridian method

Rectangular coordinate method

W.C.B = R.B

W.C.B = 180 Degree - R.B

W.C.B = 360 Degree - R.B

W.C.B = 180 Degree + R.B

W.C.B = R.B

W.C.B = 360? - R.B

W.C.B = 180? - R.B

W.C.B = 180? + R.B

Trough compass

Prismatic compass

Magnetic compass

Surveyor's compass