Frog
There are 16 water lilies in the pond. They grow in 4x4 square system (see figure).
A frog is seating on one leaf in the corner. Then jumping from leaf to leaf, but jumping over at least one leaf and never lands on a leaf, which was already. With each jump it lost a piece of coordinates.
Follow the footsteps of frogs. Pick the pieces of coordinates and find the cache.
Remember a logbook colour. You will need it to solve future task.