[DOC] [TLE] Ascent Ground School - Chapter 3 | Flight Instruments [PAR] Three basic pressure-operated instruments are found in most aircraft instrument 
panels. ... To read this type of altimeter, first look at the drum to get the thousands 
of feet, ... When the aircraft is flying at an indicated altitude of 5,000 feet, its true 
..... Local magnetic fields in an aircraft caused by electrical current flowing in the... [DOC] [TLE] Flight instrument - IVAO [PAR] Nov 21, 2015 ... The flight instruments are the instruments in the cockpit of an aircraft that ... The 
flight instruments are used in conditions of poor visibility when ... commonly 
referred to as the flap operating range since its lower limit ... The gyro in the 
attitude indicator is mounted in a horizontal plane ... Earth's magnetic field. [DOC] [TLE] PHAK Chapter 8 - Federal Aviation Administration [PAR] pitot-static system and associated instruments, the vacuum ... the magnetic 
compass. .... but is commonly used in this case to denote the approximate ... 
change between takeoff and landing even on a local flight. .... There are as many 
kinds of altitude as there are ..... of an instrument gyro are great weight for its size, 
or high. [DOC] [TLE] Heading indicator - Wikipedia [PAR] The heading indicator (also called an HI) is a flight instrument used in an aircraft 
to inform the pilot of the aircraft's heading. It is sometimes referred to by its older 
names, the directional gyro or DG, and also (UK usage) direction ... The flux gate 
continuously senses the Earth's magnetic field, and a servo mechanism 
constantly... [DOC] [TLE] Gyrocompass - Wikipedia [PAR] A gyrocompass is a type of non-magnetic compass which is based on a fast-
spinning disc and ... However, aircraft commonly use heading indicators or 
directional gyros, which are ... Therefore there are two independent local 
rotations. ... rotations we will also consider the rotation of the Earth about its North
-South (NS) axis,... [DOC] [TLE] CHAPTER 6 AIRCRAFT INSTRUMENTS [PAR] The instruments used in aircraft years ago are reasonably simple compared with 
those ... AEs frequently work with ... One general type of airspeed tube mounts on 
a streamlined mast ... twice the local speed of sound, its speed is Mach 2. ..... With 
the local barometric pressure set, the altimeter should agree to 75 feet of field. [DOC] [TLE] The Electron Drift Instrument for MMS | SpringerLink [PAR] Aug 8, 2015 ... As a by-product of the drift determination, the magnetic field strength and 
constraints ... magnetic and electric fields, and thus is immune to many local 
spacecraft disturbances. ... as used by the Spin-Plane Double Probes (SDP) and 
Axial Double ... effects because the electron beam gyrates far from its origin. [DOC] [TLE] A Brief History of Navigational Instruments - TechnologyUK [PAR] Essentially, a piece of lodestone has its own magnetic field so that, when ... The 
type of liquid involved varies, but ethyl alcohol is frequently used ... Gyro 
compass on the bridge of a Royal Canadian Navy destroyer - picture credit: Ken 
Walker ... is not affected by local magnetic fields or sources of electromagnetic 
radiation,... [DOC] [TLE] Patent US3289475 - Blind flight without gyros, methods and ... [PAR] This is a completely new concept in terms of aircraft instrumentation, since its ... 
or in combination, in place of state of the art gyro blind flight instruments. ... The 
second instrument may be used with a magnetic orientation instrument or unit as 
... the local direction of the earths magnetic field to maintain or regain control of 
an... [DOC] [TLE] Hermanus Magnetic Observatory PROCEEDINGS OF THE X IAGA ... [PAR] Mar 7, 2016 ... The Geomagnetic Field and its Secular Variation in Slovakia. 251 .... The 
instrument used by Auster is not a traditional DI-flux but ...... Another type of gyro/
theodolite combination, the GP12A gyro station is ..... The pulsations most 
commonly observed during local nighttime are Pi2 pulsations, which are. [DOC] [TLE] Dictionary of Technical Terms for Aerospace Use - V [PAR] The most common types are Pirani gage and thermocouple gage. ... that its 
electrical characteristics are essentially unaffected by the

Question: Aircraft often use the "gyro" type of this instrument, as it's unaffected by local magnetic fields
Answer: a compass