Page 21 - 4798

Exercise
0
0
0
1. The following azimuths are from the north; 329 20’, 180 35’, 48 32’,
0
0
170 30’, 145 25’. Express theses directions as
 Azimuths from the south
 Back azimuths
 Bearings
0
0
0
0
2. The following are bearings: S21 25’W, N88 42’W, N69 52’E, S42 25’E.
Express theses directions as:
 Azimuths from north
 Back azimuths
0
3. The following azimuths are reckoned from the north. FE = 4 25’, ED =
0
0
0
0
90 15’, DC = 271 32’, CD = 320 21’ and BA = 190 45’. What are the
corresponding bearings? What are the deflection angles between
consecutive lines?
4. The interior angles of a five-sided closed polygon ABCDE are as follows. A
0
0
0
0
= 120 24’, B = 80 15’, C = 132 24’, D = 142 20’. The angle at E is not
measured. Compute the angle at E, assuming the given values to be correct.
0
5. The magnetic bearings of a line is S47 30’E and the magnetic declination is
0
8 20’E. What is the true bearing of the line?
0
6. In an old survey made when the declination was 4 15’E, the magnetic
0
bearing of a given line was N35 15’E. The declination in the same locality
0
now is 1 10’W. What are the true bearings and the present magnetic bearing
that would be used in retracing the line?

19