At the posted cords you will find a sign. Note there is plenty of parking here. From this sign you will need to gather some information , do a little math.
Once you gather the information and do the math listed below no need to get back in your cachemobile as the final is a very short walk from the sign.
To get the final North coordinates take the lowest population number of the towns prison staffs family's and divide it by 100. Add this number to the posted North coordinates.
To get the west find out how many years maximum the inmates would stay and don't worry about minusing the day. Take this number and add it to the posted west coordinates.
N fubeg jnyx sebz jurer lbh ner fgnaqvat lbh jvyy svaq jung lbh ner ybbxvat sbe whfg unatvat nebhaq jnvgvat sbe lbh.