Wow, a cache by Tero_ I can solve straight away, that is quite rare. But intuition was right, how to search for the needed information (I wouldn't have known it myself), and the rest of the task looked pretty straight forward to me.
As I was passing in the area today, I decided to make a stop here on my way home. I was even lucky enough to get the second spot.
The field part was luckily pretty easy too (and luckily no high T value for once).