This folding compass with full-size sighting mirror floats if dropped in water. Sighting mirror lets you take cross bearings of your surroundings to plot exact position. Declination correction scale allows for quick adjustment of map bearings to field headings. Red/black orienting arrow and lines and red «N» at 360-degree mark allow for an easy needle match. Features inch and millimeter scales for measuring. 2-degree graduation lines are accurate and easy to read. Accurate from -40 degrees to +140 degrees Fahrenheit and up to 20,000 feet.