To determine the coordinates for the final stage use the GRID, ROW, COLUMN formula below.
Inside there are banks of boxes lining the walls separated by black trim like a grid pattern.The grid is in upper left corner, rows are down, and columns are over, this gives you a number to enter for the final location.
N 29 17. [ (G1071:R5:C4) - (G771:R2:C6) - (G171:R1:C6) ]
W 82 06. [(G1791:R5:C2) - (G1671:R9:C2) + (G531:R6:C2) ]