Help with a puzzle?

I’m trying to convert an encrypted set of coordinates.

Given:
04 33.135
533 17.961

The numbers 04 3.15 in the first set are red.

The puzzle is supposedly based on PI, given as:
314159265358979

The first set of given numbers will (more than likely) start with 35 (instead of 04), the second set will probably start with 120 (instead of 533).

Any ideas?

well

04 33.135
+31 41.592 (first digits in pi)

35 74.727
653 58.979 (next digits in pi)
-533 17.961

120 41.018
give you your lead 35 and 120 as desired

Genius! Thank you, thank you.