This collection of caches is based on the Church Micro series in the UK, which has over 12,000 caches. Given that Adelaide is affectionately known as the City of Churches it seems appropriate to have a small series hidden at historical churches.
Adelaide Church Micro – Aldinga Uniting Church
The Cache
This is a simple offset multi. At the listed coordinates look for the year the church was established. This is ABCD. Calculate the final which is a short distance away. BYOP
The final can be found at S35 15.B(2xD)(4xA) E138 29.A (4xA) (C+D)
checksum = 18
Happy Hunting