15.
Due to local attraction incorrect readings are obtained from the presmatic compass the reason could be . . . . . . . .

19.
The GPS sattelites orbital planes are inclined to the equator and spaced in the longitude, The inclination and spacing of the longtitude in degree are . . . . . . . .

20.
The F.B and B.B of each line are essentially recorded in the field for . . . . . . . .

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