There are 4 survey benchmarks on the peak to the east of the Smithsonian hut. The furthest to the west is bronze in color. What is the year it was placed on the Mountain? The coordinates are for the location of the benchmark. As you might expect from such a lofty location I had a lock on 12 satellites!
Before you seek this cache you should research this hike carefully. It is not done casually. I recommend the following web sites for information:
Whitney Portal Store
Hiking Mt Whitney Web Site
John Muir was the 5th person to make it to the summit in October of 1873. He hiked from Independence on foot! You can read about it here:
Mt Whitney REI
This is also the start (or end) of the John Muir Trail.
Once again, research, plan, be in shape and enjoy the incredible view.