This is the bonus cache for this Lab Adventure. To find the co-ordinates of this geocache, complete the 5 stages of the "Bridges of Annapolis County-West" Adventure Lab Cache.
Each stage will give you a clue. Once you have the values for A,B,C,D,E, then the final co-ordinates are:
N 44 4A B18, W 065 3C D1E