This is the bonus to reward you for completing the Adventure Lab. Hopefully the weather was OK and you enjoyed your walk around the gardens, there is yet more to discover and you may well have done so! The posted co-ords are of no use at all, What you need to do is make some sensible co-ordinates out of S43 53. ABC. E171 45. DE. these will have been collected from the Lab. Please have a pen with you and be careful at GZ, do not drop the cache!!
Access the Adventure Lab here
https://adventurelab.page.link/1V8k