The above co-ordinates are for the area of free parking.
You will need a pen or pencil.
The final co-ords are N 50.DA.GIH. W 000.NP.MLJ. N=K-(J*D) P=(B+F)/I
After you have visited the cache, you could continue the circular path up and around the hill top with some great views further on, such as at N50.51.320 W000.07.200, where you can rest, gaze down at your car, and see Birling Gap.
Then either complete Wild Woods Too, or carry on around.
Further round there is a dew pond where there are views over Brighton down to the sea, then it's all downhill back to the car.
Cache too small for goodies or certificates I'm afraid.
You can check your answers for this puzzle on GeoChecker.com.