The posted coordinates will take you to a spot of local legend. There are many variations on the story associated with this tomb. The most popular one states that the recess on the tombs cover with the hand holding the knife fills with blood on Halloween.
Though creepy sounding, the phenomenon is actually fairly common. It has to do with the type of stone the marker is made out of.
Not much is known about John Orr Sr. or his wife Martha. With a little research I've found that John was born in Ireland, the son of two Scots. He was a farmer by trade, but had retired by the time of his death. His granddaughter, Mary, took care of him at the end.
To find the final:
AB= Add the days on which the couple died
C= The month John died
*Add ABC to the given North coordinates
DEF= Martha's age +200
*Subtract DEF from the given West coordinates
Please use discretion when hunting for this cache. If there is a ceremony in progress, please wait patiently or come back at another time. The cache container is not on or near any markers.