The NDUR Lensatic Compass is great for anyone's survival bag to help one if the situation arises where they are separated from their group lost their way on the trail or find yourself in a dire drastic survival situation. It is ideal for determining location and terrain features to follow a set course orient a map and more. This compass is extremely rugged and tough.Features: Durable Metal Case Liquid Filled Rear Sight Sighting Slot w/Lens Sighting Wire Fixed Index Line Rotating Bezel SCALE 1:25000 METER 3.6oz (102g) 3 x 2.25 x 1.25 (7.5 x 5.5 x 2.5cm)