GZ will take you to a historical sign located outside Bryan, Ohio. Answer the questions below and do the math to find the cache and earn your Smiley.
N41° AA.BBB W 84° CC.DEE
AA = The last two digits of the year of the first scheduled night flights through Bryan (July 1, 19XX) plus the R number (R-X). This will give you AA.
BBB = Last three digits in the year the Bryan Air Mail Field marker was placed (2XXX).
CC = Air mail service reduced coast to coast mail delivery from 87 hours by rail to XX hours by air.
D = A survey flight was established for air mail services between _______ and _______. Subtract the number of letters in the first city from the number of letters in the second city for the D value.
EE = Air Mail Field was relocated X.X miles north of this site in July of 1924. Reverse the digits in this number and subtract from it the first digit of the maker number (X-86). This is EE.
The cache container is a small lock-n-lock and, as per geocaching guidelines, is located within 2 miles of GZ. Room for swag and travel bugs. Cache activity may cause a container to "migrate" slightly so be sure to use your geosense when hunting. Bring your own pen, play fair, practice kindness, be safe, CITO when needed and above all enjoy the sport!