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A-Fluxgate compasses are also known as electronic compasses. They have many advantages over the standard magnteic compasses but the principal advantage is their extreme accuracy (+-0.5 degrees). They also have large digital readouts and can be connected to NMEA 0183 electronics. They do have a major flaw however, and that is being electronic and subject to failure, power loss, or can be damaged by lightning. Given the low cost of the magnetic compasses, it is advisable to keep a good magnetic compass at hand as a backup.
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