Steroids and other medications. Long-term use of oral or injected corticosteroid medications, such as prednisone and cortisone, interferes with the bone-rebuilding process. Osteoporosis has also been associated with medications used to combat or prevent: Seizures; Gastric reflux; Cancer; Transplant rejection; Medical conditions
The main functions of using a compass are: 1  tell which direction you are traveling - your heading. 2  tell which direction an object is from you - its bearing. 3  keep you following a straight line of travel. 4  orient a map - aligning a map with the actual land.  triangulation - determining your location with a map.
The marine magnetic compass at sea is mainly used for steering a course. The compass reading must be accurate, especially on long sea passages, because a error of one or two degrees in a long course can make a difference of thousands of nautical miles in reaching your destination after many days.he Principles of the compass. A Magnetic compass is a critical piece of marine navigational equipment. Simply put, a magnetised needle, suspended freely, points North because of the forces caused by the Earthâs magnetic field. Once North is known, the other directions are easily found.