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.
All Vector binoculars include an eyesafe laser rangefinder, x7 magnification, a digital magnetic compass
and anti-reflective caps which work to minimise the risk of the user being detected.
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
For instance, Chinese society created or independently invented irrigation systems, movable type, the magnetic compass
, rockets, immunization techniques, and mathematics-based mapmaking.
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