Practical and lightweight, it can be fitted to your watch wrist-strap within seconds (not suitable for metal straps). Wrist compass slides onto watchband perfectly, it is also great for paracord survival bracelets.
To use the ranger counter beads you first need to count how many paces, or strides, you take to cover a given distance. 100 metres is a good distance to begin with as if is simple to divide into. Once you have walked nine beads, so 900 metres, at the next 100 metres you pull one bead down form the 4 bead group.