The feature try to simulate a real case scenario where:
-The hunter first and foremost needs to get familiar with the area he is going to search for treasure. For this reason he must spend some considerable time. Once the hunter learns a region/port well, he will remember is for quite some time. This means that he can search anytime in the same port, without needing to re-explore. Of course, as much time passes, he will start losing memory but only real slowly (1% per region per week).
That's obviously wrong or there's a bug. The explore rate is not decreasing. NEVER. (is it never or ever? f*****ing english)
