A buddy and I are planning on going up the main trail of Whitney next week. We have been training for awhile on local 10k+ peaks and such. This will be the biggest mountain we have attempted. We have most our cold weather gear ready, I had a couple of questions.

At this time of year will the trail be somewhat easy to navigate or should I get a GPS?

Also, we have our ice axes, crampons, and snowshoes ready to go. Should we bring a helmet as well? I seem to be hearing mixed reports on the helmets.

Thanks for your help!