Cache placed between a new and old pair of places. both raise questions as to their purpose.
To calculate the GZ, a link to a list of clips is here.
The procedure, I trust is evident and simple.
The clips all play and save using Videolan (VLC) and on Android. (Click back <- to see next clip).
LIST THE LETTERS AND FIND THEIR SUM i.e. b + r = 2 + 18 = 20 etc.
Divide the Total by 1000
Add Result to N12 51.006 E100 54.274 for GZ