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A listing of Direction Sensor Manufacturers which are not listed on the main Sensor page. The companies are listed in alphabetic order.
The types of products or devices they produce are listed under the company name, in alphabetic order. These are Magnetic Sensors used for Electronic Compassing Solutions.

Direction Sensor Manufacturers

Honeywell
{Magnetic Sensors; Digital Compass w/ I2C interface}

Precision Navigation "PNI Corp"
{Magnetic Sensors; 3-axis compass modules}

Global Map of Magnetic Declination

Definition of Magnetic Declination;
The magnetic field is different in different places over the globe.
In fact, the magnetic field changes with both location and time and changes the way it is changing.
It is so irregular that it must be measured in many places to get a satisfactory picture of its distribution.

A compass needle does not point toward the magnetic pole.
The compass points in the directions of the horizontal component of the magnetic field where the compass is located, and not to any single point.

Knowing the magnetic declination [shown above],
which is the angle between true north and the horizontal trace of the magnetic field, for your location,
allows you to correct your compass for the magnetic field in your area.

"The earth's magnetic field is about 0.6 gauss in an open-air environment, and has a direction from the magnetic south pole to the magnetic north pole.
This pointing to the north pole is the basis for magnetic compassing...
Two-axis magnetic compasses measure the horizontal vector components of the earth's magnetic field using two sensor elements in the horizontal plane but orthogonal to each other.
Three-axis magnetic compasses contain magnetic sensors in all three orthogonal vectors of an electronic compass assembly to capture the horizontal and vertical components of the earth's magnetic field...": Honeywell Inc.

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