The containers all have vinyl logs (no more wet logs).. They are mostly camo'd pill bottles, placed in guardrail ends or on posts between bolts, to help secure the container.. There is one mkh in the series..
A permanent marker works best, however a pen or pencil will leave a dent.. Dents are acceptable.. Coords have been averaged a minimum 100 times to within +/- 10'.. Because of all the bounce from the trees and hills, your readings may differ. So, a generous hint is provided..