The coordinates will take you to a signpole in the central park of Espoo.
The signs indicate your distance from many places (in kilometers).
A = Distance to Tapiola
B = Distance to Henttaa = Distance to Espoon Keskus - 4,7
C = Distance to Puolarmetsä = Distance to Henttaa + 0,2
Now proceed to
xxx = 998-50*A-20*C
yyy = 101+50*A+14*C
Once there, look for a number in wood. Let the number be D.
Final cache is at
aaa = 40*B+D+1
bbb = 13*A*D+30*B-4*C
Round off the decimals and add an appropriate amount of zeros in front of the result where needed.
Don't delete final coordinates from your GPSr. You'll need those with Pentagram-5. In logbook there's also crucial clue for Pentagram-4.
The box is ½ litre Tupperware.
Links to other caches in this series: