Note: The cache is not at the posted coordinates.
To find this cache you got to identify the two persons shown on the above photo. Both, the son and his dad shared the exact same name. Once you know who they are find out the dates of their stay on earth and do the following calculations:
North 45° XX.XXX= (father's year of birth x son's year of death) ÷ 160380.4904
West 71° YY.YYY= (father's year of death x son's year of birth) x .00001460193
Since this is a micro please bring your own writing implements. As usual any spoiler will be deleted immediately. Good luck!