All the numbers are whole numbers.
No two numbers are the same and no number has a value less than one.
1. A1=either D3 plus C4 or D3 minus C4.
2. A2=either B2 minus C2 or B2 plus C2.
3. A3=a third of B4.
4. A4=either B1 minus C3 or B1 plus C3.
5. B1=either a third of D3 or a sixth of D3.
6. B2=D1 minus B1.
7. B3=either D2 minus D3 or D2 minus A3.
8. B4=either 6 or 7.
9. C1=half of B3.
10. C2=either A3 tripled or A3 plus B4.
11. C3=B3 minus D4.
12. C4=B1 plus C2.
13. D1=either A4 plus B4 or A4 times B4.
14. D2=A1 minus B1.
15. D3=C2 times B4.
16. D4=C1 plus B1.
The first stage can be found at: N51° 33.YYY W001° 23.ZZZ
Where YYY = (A1+A2+A3+A4+B1+B2+B3+B4-D1-A3) x (C2-B4)
and ZZZ = {(C1+C2+C3+C4+D1+D2+D3+D4-D1+A4) x (C2-A4)} - A3