Up, Up and Away Mystery Cache

The listed coordinates are at a historical marker for Thaddeus Lowe, a Jefferson native who was the Chief Aeronaut of the Union Army Balloon Corps during the American Civil War.  Final coordinates for this cache are N 044 26.7AB, W 071 31.6CD. Information needed to solve the puzzle is included on the marker.

Thaddeus Lowe died in 19AB

Subtract 1735 from the year of Thaddeus Lowe's birth=6CD

During the Civil War, Thaddeus Lowe made regular flights over Confederate strongholds and battlefields - and once even crashed in enemy territory, but was able to convince them he was not a spy but a man of science studying the Earth and only happened upon them.