On a clear day Mystery Cache

The cache is NOT at the published co-ordinates.

You need to derive the location of the cache from the information provided below.

I wanted to place a 5/5 cache to mark 2000 caches found. It is a bit late, but it is now placed.

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Some notes for this cache:

• Do NOT attempt alone.  The cache is placed in a fairly remote area. There is a medium strength cellphone signal.
• At all times you alone are responsible for your safety.
• The direct approach to the cache will require at least 30m of climbing rope. 
• Jumars may be needed for the ascent and abseil skills will be needed for the descent.
• BUT, there is an alternative approach that does not require serious climbing aids,  You need to find this route if not doing the direct approach.
• On this approach, a short length of rope will come in useful once close to GZ.
• Allow at least 3 hours to complete this cache and return to your car.
• Suggested parking co-ordinates are supplied with the geochecker.
• It may be advisable to first do a recce run to determine equipment requirements.
• Not recommended for children under 12.
• Container altitude is ~409m ASL.

Spoiler logs will be permanently encrypted.  Sharing of the final co-ordinates is NOT geocaching PC!