magnetic compass


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magnetic compass

[mag′ned·ik ′käm·pəs]
(navigation)
A compass depending for its directive force upon the attraction of the horizontal component of the earth's magnetic field for a magnetized needle or sensing element free to turn with a minimum of friction in any horizontal direction.

magnetic compass

A compass that acquires its directive force from the attraction of the horizontal component of the earth's magnetic field. The simplest type is a magnetized needle or a sensing element free to turn with a minimum of friction in any horizontal direction.
References in periodicals archive ?
For target acquisition a GPS, a digital magnetic compass with 0.3[degrees] accuracy, an 830-nm Class 3B laser pointer operating at two different power outputs (65 and 200 mW) and a detachable five-kilometre laser rangefinder can be added.
To create a successful demonstration of magnetic domain structure, it is not sufficient to merely place many ordinary magnetic compasses in a tray.
Knowing in advance how these instruments, plus the magnetic compass, bottom, behave in normal flight pays enormous dividends.
The system developed for the IdZ programme, currently in limited operational use with the German contingent with ISAF in Afghanistan, includes a Navipad, which is a ruggedised PDA with an integrated digital magnetic compass made under license by Eads Defence Electronics.
You set the time and date about as you would when programming a digital watch, then enter your latitude zone (clearly shown on a map in the instruction manual), your magnetic compass deviation zone (also from a map), your longitude zone (from another map), and whether you're on daylight saving time.
COMPONENTS FOR A MAGNETOMETER (Radio Shack part numbers in parentheses) Item Remarks Magnetic compass Needs to have transparent housing Op-amp integrated LM-741 circuit or equivalent (276-007) Resistor 820 ohms, 1/2 watt (271-022) Resistor 4.7 megohms, 1/4 watt (can use five 1-megohm resistors, 271-1356, in series) Light-emitting diode Infrared type (276-143) Phototransistor Infrared-sensitive NPN type (276-145) Solenoid The coil of a dismantled reed relay (about 20,000 turns of 0.06-mm wire) Rod Made of soft iron, about 50 mm long Potentiometer 10-kilohms, 15-turn type (271-343) Power supply Regulated, +15 and -15 volts DC, 100 milliamperes Circuit board (276-147) Sheets of acrylic Ideally 8 mm thick for rigidity
Limited Tenders are invited for Procurement Of Magnetic Compass
For instance, Chinese society created or independently invented irrigation systems, movable type, the magnetic compass, rockets, immunization techniques, and mathematics-based mapmaking.
Tenders are invited for Laser Range Finder (Lrf) Integrated With Digital Magnetic Compass
Subsequent studies of their late-night hikes suggest they use odor and perhaps some kind of magnetic compass, report Lars Chittka of the University of Wurzburg in Germany, Thomson, and their colleagues.
Certain types of migration appear to require the magnetic compass.