You will have to visit the Palmerston Cemetery and gather some details to determine the location of the final cache.
The cache is a 100 ml pill container with log only and is located at S 45 2A.BCD E 170 4E.FGH
WP1 The above coordinates will take you to waypoint 1. At WP 1 find:
Flying Officer # 4216XY4. A = X + Y
Flying Officer # 421B221. B =
Cpl. Athol McGregor # 421Z5. C = Z + 2. C =
Pte. Patricia McGregor NZWAAC # 8222D8. D =
WP 2 is at S 45 29.587 E 170 41.981 and is another McGregor plot.
William died at age 7E years. E =
Charles died in the year 19F8. F =
Charlotte died on G Jan 1928. G =
Charles died at age H3 years. H=
Final Cache is at S 45 2A.BCD E 170 4E.FGH