Combine the Williams Compass and Whistle with a good map and you have everything you need to stay safe out on the hills. For extra reassurance both compass and whistle come with an infinite length battery life.*
Expedition compass with clear and precise markings for ease of use when navigating. Grid reference and distance scales for OS, Harvey and BMC maps with a reflective needle and damping oil in the bearing for more precise readings.
Survival whistle for whistling really, really loud in emergency situations: bright orange, shrill, you know the sort. Clip for attaching to your rucksack, eyelet for a lanyard and EN ISO 12402-08 compliant for attaching to life jackets.
*Batteries not included. Or needed. Whoop!