Sometimes, you just need one for the numbers. How about one that has you use numbers to enable you to get one for the numbers!? This is a 3-part multi with the waypoints and final location nearby. At the posted coordinates, you will find something yellow with a 7-digit number followed by an "E".
Using this number, solve the following for N34 29.ABC W117 22.DEF
A=1st digit + 4th digit, B=5th digit - 1st digit C=6th digit - 4th digit - checksum = 17
D=6th digit, E=6th digit x 7th digit, F=2nd digit + 4th digit - checksum = 13
At the second waypoint, you will find a flat metal object that appears to be quite heavy. On this object, you will find some writing along with a 4-digit number. Using this number, solve for N34 29.GHI W117 22.JKL
G=3rd digit - 4, H=1st digit + 4, I=4th digit x 1st digit - checksum = 17
J=3rd digit + 2, K=2nd digit x 1st digit, L=4th digit - 2 - checksum = 21
At this third waypoint you are searching for the cache!