Definition

Noun: A magnetic compass is a navigational instrument for determining direction relative to the Earth's magnetic poles. It operates using a magnetized needle or card that aligns itself with the Earth's magnetic field, indicating magnetic north.

Usage

The term magnetic compass is used to specify this traditional type of compass, distinguishing it from modern electronic or gyroscopic navigational aids. It is a standard tool in navigation, surveying, and outdoor activities.

Examples

• The sailor relied on a magnetic compass to chart the ship's course across the ocean.
• Before the hike, she checked her magnetic compass to ensure they were heading west.
• The invention of the magnetic compass was a pivotal moment in the history of exploration.

Advanced Usage

• "to steer by the magnetic compass": To navigate using the primary direction indicated by a magnetic compass.
  • With the GPS malfunctioning, the pilot had to steer by the magnetic compass.
• The difference between the direction indicated by a magnetic compass (magnetic north) and true geographic north is called magnetic declination, a critical factor for accurate navigation.

Variants and Related Words

• Compass (n): A broader term for any direction-finding instrument, which can include a magnetic compass, gyrocompass, or digital compass.
• Compass needle (n): The magnetized pointer within a magnetic compass.
• Compass rose (n): The circular diagram on a map or compass showing directions.

Synonyms

• Navigational compass
• Mariner's compass

Notes

The magnetic compass points toward the Earth's magnetic north pole, which is not the same location as the true north pole (geographic North Pole). This distinction is essential for precise navigation.

Noun

1. compass based on an indicator (as a magnetic needle) that points to the magnetic north