Compass has a half-life of only about 12 years, so a compass that contains 120 mCi of tritium when new will contain only 60 when it is 12 years old, 30 when it is 24 years old, and so on. Consequently, the illumination of the display will fade. Mariners' compasses can have two or more magnets permanently attached to a compass card, which moves freely on a pivot. A "lubber line", which can be a marking on the compass bowl or a small fixed needle, indicates the ship's heading on the compass card. Traditionally the card is divided into thirty-two points
Compass Point Studios Compass Point Studios Compass Point Studios was founded in 1977 by Chris Blackwell, the owner of Island Records. In the late 1970s and mid-1980s, many musical artists from across the world came to the Bahamas to record music at its facilities. Many producers, including Chris Blackwell himself, used the studio to produce recordings. AC/DC's "Back In Black", the third highest selling album ever, was just one of the many albums recorded there. Other well-known artists who recorded there include: Emerson, Lake & Palmer, Julio Iglesias, Serge Gainsbourg, The Rolling Stones, Etta James, Colin James, The Tragically Hip, Grace Jones, Shakira,