This sign is about an event that occured on Lewis and Clarks
trip, and gives the date of the event.
The actual geocache is located at:
N 38 3A.BCD w 092 0E.FGH
A = Half the last digit of the year.
B = Half the second digit in the year.
C = Last digit of the year.
D = First digit of the year.
E = The month as a digit.
F = Last digit of the year minus 1.
G = Third digit in year.
H = Day of event.
Check digits: A+B+C+D=11, E+F+G+H=13.
Congratulation to Mongo Travelers for being FTF!