1. Safi 1996

2. n Safi as viewed from the northwest looking to the southeast.

3. Safi 1996 n The “Map”. n The POST. n And the Total Field Station.

4. Safi 1996 n The “Map”. n The POST. n And the Total Field Station.

5. Safi 1996 n POST to 287N measured.

6. Safi 1996 n 287N to POST. n 986.1550m or 0.6128mi

7. Safi 1996 n Angle 287N-POST- 289N measured.

8. Safi 1996 n 289N to POST. n Distance?

9. Safi 1996 n POST to B measured. n Angle B-POST- 289N measured. n POST to 289N missing

10. Safi 1996 n 289N to 287N computed from British survey map coordinates. n Distance is 1842.77m or 1.1450mi.

11. Safi 1996 Law of cosines: Law of sines:

12. Safi 1996 n Trig supplies remaining sides and angles. n 289N to POST distance is 1314.9738m or 0.8171mi.

13. Safi 1996 n POST is at intersection of circles. n (135610.32, 123322.23)

14. Safi 1996 n A little more trig gives the location of B and the orientation of the segment POST-B.

15. Safi 1997 n Remeasured in 1997. n POST to 289N was 1317.3132m. n POST to 287N was 986.1419m.

16. Safi 1997 n 287N to 289N – -2.0292m/1842.77m – -1.1012m/km – -69.7703in/mile – 0.11% error n POST to 287N – 1.32cm/986.1550m – 1.3385cm/km – 0.85in/mile – 0.0013% error