For those who like to be out for a stroll/hike and quantity hunt.
Remember to take down those hints for the bonus cache at specific waypoints.
Be care on the handling of the cache as there is H2O risk.
WP Hint : look to your north, on the right side of the "knife shape" factory building, how many pairs of exhaust outlet are there; take this number as "B" for the bonus cache.
Enjoy & have fun !