With Highway 8 Letterbox/Multi caches in KI Ki and Keith, I'm hoping to to continue on into Victoria at Kaniva. As a regular traveller on this road, I'm keen for more caches to break the trip, and this is my contribution.
At the listed coordinates you are standing in front of Kaniva Post Office, which is currently for sale. Use the numbers on the post office box numbers to calculate the coordinates of the cache.
Let ABC be the number of the box to the right of #90.
Let XYZ be the number of the box below #139
The cache is located at S 36° 22.(Y + Z)(X - A)(Y + A + X) E 141° 13.(Z + Y)Y(C - X)
The check sum of the minute decimals is 30.
The cache favours westbound travellers, but only by a short distance. Please remember that the stamp stays in the cache! Park carefully near GZ and take care with busy roads. Enjoy the stop in Kaniva and have a safe onward journey.