This cache is not at the above coordinates. In order to find this cache, you have to find the Pentland Ridge Multi-cache, and read on the bottom of the box to get the coordinates for this cache.
This cache is a reward for having done so much hard work to find Pentland Ridge, and in finding this cache, you are indeed a very dedicated and heroic cacher, climbing up and along 5 tops in the Pentland Hills, battling against the forces of nature (i.e. the constant strong wind), just to find a little box! The difficulty in this cache is actually aquiring the coordinates, not solving a tricky puzzle or anything!
The cache is located near Bonaly reservoir, so a good walk will be needed in order to get to the cache. The walk is about 5km long and should take between 1 and 1.5 hours, depending on weather conditions, etc. The coordinates listed above are for parking, which is just above Bonaly Scout Centre. From the car park, walk straight up the path and keep going until you get to the fence/gate. From here follow your GPS until you find the cache.
An alternative route is to park at the bypass below bonaly (there is another additional waypoint for this). From here, you would walk up to Torduff reservoir and at the reservoir, turn left and go along the dam and up the hill. From here, you go down along the fence and up and through the side of the woods. At the edge of the woods, you will see in the distance a line of trees which is bonaly reservoir. There is a path that goes to the right, heading for the right side of the line of trees. Take this path. Your GPS should lead you there as well if my description makes no sense at all!
Once you have found the cache, a good way back is to continue on and go up to the top of Capelaw Hill, then back down to the path which takes you to White Hill (the hill above Bonaly scout centre and the parking area). From here you simply descend the hill and walk back to the car parking area (you could also do a short detour and get GC1G16M, ... -.-. --- ..- - while you are there). This whole alternative walk described will take anything between 1.5 and 2 hours. It is approximately 6.7km long.
Both walks will require good walking boots as the ground can get pretty muddy in the area. It would make an ideal afternoon/morning walk. Good luck!
Also, please make sure the cache is re-hidden properly as the location is quite exposed to muggles that could glance and possibly see the cache if it is not hidden properly.
Thanks and enjoy!