Figure 4.1-3 Remote Gyro Vertical Compass Card

minimum (such as a wing tip). This sensor converts magnetic energy to an electrical

voltage, which then drives electrical motors that turn the compass card to reflect changes

in aircraft heading (see Figure 4.1-3).

Figure 4.1-3 Remote Gyro Vertical Compass Card

Because the compass is gyro-stabilized, it is not subject to "G-loading" and continues to

function in high-G environments. The aircraft's magnetic heading is found under the white

triangle at the top of the card.

As a backup to the primary system, all aircraft have a Stand-by Compass (see Figure 4.1-

4). This is a direct reading compass in which the measurement of direction is taken directly

from a balanced/pivoted magnetic needle. The stand-by compass is sometimes called the

"wet" compass because it is filled with a fluid to dampen needle movement. This compass

is unstable during maneuvering, but it has the advantage of reliability and is independent of

the aircraft's electrical system.

4.6-12