Only 15mm in diameter! This super compact button compass is lightweight and compact and is fitted with a watchstrap slider for Nato and fabric straps up to 22mm wide. Silva quality Swedish steel luminous disc face is marked with red N, black E, W and S with black guide markings for NW, NE, SW and SE. Disc is mounted in an extra smooth bearing for reliable operation. Almost unnoticeable when carried on the watchstrap, yet most likely to come in handy during an emergency.