The Stirling Timepieces Pathfinder is a perfect companion to any tool watch. Whether you are operating on foot or vehicle borne, the Pathfinder provides quick orientation to gain your bearings and re-orientate yourself.50m water resistance Watch Compass Size Campbell 20mm Durrant 22mm Fraser 20mm Gibson 20mm Jarvis 22mm Upham 22mm Please note, the Pathfinder Compass does not fit the military strap provided with the Burton. Note: Button compasses should not be relied upon as a sole navigation tool due to their lack of precision. Due to the manufacturing process some compasses may contain a very small air bubble although this will not affect the usability or accuracy. Avoid loosening the screws to fit thicker straps, as this can lead to lost parts, which will be your responsibility Compass does not fit rubber/leather straps or metal bracelets