The cache is a re-incarnation of Navigull's Ring Around Pupuke (GCHBT6). All the details have remained the same.
You need to visit specific co-ordinates, record information, then use trigonometry, plotting and navigating skills. It is not a 5-minute drive by so allow several hours. You most likely will have to visit more than once.
This cache starts by going to site A recording information and using it to proceed to site B, recording information to get to site C etc.
The twist is that all the sites are on the circumference of a circle centred in the middle of Lake Pupuke in Takapuna. You need to derive the circumcentre of this circle see M@'s Circumcentre 2 cache. Once you have this position you will need to plot the bearing (info found at position C) to get to position D which is the final cache site and which also lies on the circle mentioned above.
At the small scale involved it is quite possible to plot the positions on a map and avoid doing the mathematics but for anyone who has cracked M@'s circumcentre caches the maths will be no problem.
To get started go to the listed position (S36 46.552 E174 45.770) and look for a, somewhat obscured, (not the obvious ones) plaque and record the year and the months mentioned.
Then subtract the LAST TWO digits of the year you recorded to correct the false decimal places in the following
Position B Latitude S 36 46.984 (e.g. .984 - 20 =.964) not the real figure
Then subtract the NUMBER of the SECOND month on the plaque from the decimal part of the following
Position B Longitude E 174 45 .574 (e.g. .574 - 10 =564) not the real figure
Now go to your corrected, position B and look for a clue, which will get you to position C. Once you have the position C you will have the information to derive the circumcentre position (the centre of the circle on which all the other positions lie). When you search around position C you will find a clue giving you the bearing from the circumcentre to the final cache position (D).
Note you do not need to physically visit the circumcentre position but you will need to plot it on a map and draw in the bearing to the final cache position D on that circle.
So grab your GPS, a map, a pair of compasses, some paper, sharpen your pencil and go to it! One last piece of information - due to some muggle activity at the final position, the cache is now situated 40 metres due east of the calculated final position.
Note: The bearing available at site C is TRUE, not magnetic, (variation is currently 19 degrees 24 minutes East) so remember this. Also some of the reserves round the lake have their gates closed around dusk so do not get your car trapped.