This series is created to meet the demands from Boy Scouts/youth organizations, hikers to use on shorter day trips and schools. Patented red/black north/south lines in the capsule (Field 7 and 26) and a north indicator on the compass needle are standard on the Field series. A full-function mirror-sighting compass at a very attractive price-point! Large sighting-mirror and mm/inch map measuring scales. Lightweight and compact design. Perfect for land and sea navigation where accurate sightings are needed. It floats!