At the posted coordinates, (stage 1) use a bit of simple math from the info on the plaque to solve for A,B,C,D,E,F
Birth Year;
A= second digit
B= second digit minus first digit, then divide by two
C= third digit minus fourth digit
Death Year;
D= first digit added to the fourth digit
E= second digit
F= fourth digit minus fourth digit
If you need it..... Checksum is, A+B+C+D+E+F=25
You can park on the street for a short walk or drive to both stages.