We're talking balls
Not at published coordinates
Can be worked out at home
This should be as is as easy as it looks but my test subject struggled
Work out the coordinates from the pictures & follow instructions underneath...

Cache is therefore at...
N 53 38
American Football + Snooker
Golf
Ten Pin + Tennis
W 02 38
Half Rugby
American Football
Basketball
Finally if the pictures or resulting numbers confuse then you may want to know that Boundary has touched the ground first, Rugby is league & unconverted, American football is also unconverted & Basketball is one side & only those playing on the court at the time
P.S. If you feel the final GZ coords are a bit off then please let me know & I will revisit - many thanks...
You can check your answers for this puzzle on GeoChecker.com.