The classic magnetic compass - still popular for it's simple reliability - in a larger, easy-to-read size. Attaches in just seconds to any smooth surface in car truck or boat. Mounting suggestion: dampen the suction cup slightly for an even stronger grip. To remove, peel up edge of cup to release vacuum. Cup can be mounted on non-smooth surfaces with adhesive Velcro/hook--loop tape (not included but widely available at hardware stores.) Quality design and construction made in Taiwan.