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 magnetic compass was one of the first flight instruments. Even today, it is frequently the only direction-indicating instrument found in aircraft equipped only for VFR flight. The compass is a reliable, self-contained unit requiring no external power source.urns using the magnetic compass can be accomplished best with the aid of the turn co-ordinator and the clock. In a two-minute or standard-rate turn, as shown on the turn co-ordinator, the aircraft turns through 360 in two minutes, or 3 /sec.