"A Simple Offset at Châtelaillon-Plage" Multi-cache

You are at Châtelaillon-Plage. A little village where they live from the sea. Most people here do professional fishing the Mussels and Oysters. At this place there are some locations to hide a cache and have fun with the geocaching stash hunt. This one is a simpe offset cache. that's means that you have to solve puzzles at the start location, to get the coordinate of the stash location. Okay, lets start: 

The endcoordinate is at :

N 46 03.ABC
W 001 04.DEF

Question
How many cars could be parked at 'HIPPODROME'

The answer is XY

To calculate the stash coordinate calculate the value for each character and fill out the stashcoordinate

Z = Y / 2
A = Z + ( X - Y)
B = X + Y
C = X + (Y - Z)
D = X
E = 2 * Y 
F = A