Other than the normal stuff that you obviously need, a couple items I like to bring are:
Camera: take pictures of your targets instead of saving the target. Track your performance.
Shot Timer: Also to track your performance.
Binoculars or a spotting scope: Maximize your time by not having to walk down every time you want to check your targets.
LRF: how far away is that target really? Is that really 25 yards, 50 yards, 100 yards? How do you know if you don't check?